feat(crafting): support cancellable Q and Ctrl-Q delivery

README.md

@@ -37,19 +37,39 @@ File-level atomic replacement is **not** atomicity with Minecraft inventory/play
 
 Abandonment skips remaining queued writes and schedules cleanup for acknowledged, never-issued creations. Cleanup checks the original file identity/creation and modification attributes and exact bytes under the repository lock. Changed, replaced, corrupt, symlinked, busy or unidentifiable files are retained. Partial-save failure cleans only acknowledged creations and reports uncertain targets without deleting them. Shutdown rejection preserves records rather than inventing successful cleanup. Repeated cleanup cannot delete a later file. Restart never reconstructs cleanup authority from revision zero or scans records for automatic deletion/reissue.
 
-Thirteen craft-persistence tests cover these backend boundaries, including worker timing, partial/post-rename failures, ownership changes, restart, shutdown, claim/abandon races, and mutated/cancelled observer futures. This is **not native inventory delivery**: the controller still must contain vanilla consumption, validate current view/lifecycle/content and commit actual items. Filesystem locks coordinate cooperating writers; concurrent external filesystem mutation must be excluded/coordinated. File flush/atomic rename does not establish directory power-loss durability or Minecraft/plugin-save atomicity. Empty coordination `.lock` files remain after YAML cleanup; they must not be unlinked casually because that can split locking between writers. Their file-count growth still needs a bounded coordination design before gameplay registration.
+Thirteen craft-persistence tests cover these backend boundaries, including worker timing, partial/post-rename failures, ownership changes, restart, shutdown, claim/abandon races, and mutated/cancelled observer futures. This is **not native inventory delivery**: the controller still must contain vanilla consumption, validate current view/lifecycle/content and commit actual items. Filesystem locks coordinate cooperating writers; concurrent external filesystem mutation must be excluded/coordinated. File flush/atomic rename does not establish directory power-loss durability or Minecraft/plugin-save atomicity. All create/update/cleanup mutations now share one fail-fast `characters/.records.lock` coordination file, so abandoning new characters does not accumulate one lock file per ID. Read-only atomic-file loads remain unlocked. The file stays present but its OS lock is held only for an operation, not an administrator-unlock flag. Never unlink it while writers may use it. Old per-ID lock files are left intact; no new ones are created.
+
+**Upgrade boundary:** stop all older per-ID-protocol writers before opening the same data directory with this shared-lock implementation. Mixing versions or hot-reloading while old worker writes remain queued is unsafe. YAML format and record filenames are unchanged; no deployment or existing-server data migration has been performed. Contention between cooperating repository instances fails without mutation and can be retried, rather than blocking a server tick or deleting coordination files.
 
 ## Paper sheet and recipe definition
 
 `CharacterSheets` renders one Paper sheet from a saved live record, with its current name and the exact offhand instruction. `fantasystick:sheet_version` (integer 1) and `character_id` (UUID string) identify the character, with no owner lock or duplicated progress snapshot. Identification is only a reference: it does not authorize entry or replace saved-state/session validation. Rendering from a dead record is refused.
 
+`CharacterFactory` allocates a fresh UUID and randomized two-part character name when explicitly called. It reuses the progression initializer for zero stats, level 1/zero XP, configured unspent points and full base health, with empty abilities/loadout/cooldowns and no prior death. Name collisions are allowed; identity is independent. Construction and recipe previews do not invoke allocation. Unit tests check fresh defaults/configured arbitrary-precision points, request-time allocation, seeded name variation and same-name/different-ID characters. A native composition test prepares a planned batch through YAML and verifies individually named sheets/IDs after native serialization without consuming or delivering inventory items. The actual craft-event controller is still absent.
+
 The `fantasystick:character_sheet` shapeless recipe definition contains one stick, paper, feather and ink sac. Character creation is **manual player crafting only** (inventory grid or crafting table). `ManualCraftingGuard` cancels this recipe's automated `CrafterCraftEvent` before native consumption/ejection, without touching other recipes or reversing cancellations; register the guard with the eventual completed-crafting adapter before exposing the recipe. Its preview has no character metadata and allocates no identity/name. It is deliberately **not registered** yet: actual completion, bulk crafting, cancellation/save handling and anvil rename persistence still need their event adapters. Presentation edits preserving metadata are tested, not a claim that complete anvil transactions work.
 
 ## Manual craft planning (not delivery)
 
 `ManualCraftPlan` reads real crafting inventories without mutation. It calculates one result for cursor/number/offhand clicks, distinct empty destination slots for shift-click, and single/bulk intent for Q/Ctrl-Q. It bounds quantity by ingredients and storage capacity, preserves native reverse storage order, rejects cancelled/non-craft/wrong-recipe/malformed input, and snapshots full item data rather than retaining mutable native stack mirrors. Returned leftovers are detached copies; `matches` detects changed inputs, result, recipe, cursor or planned destinations without overwriting intervening items.
 
-This is **not a transaction commit**. Nine native planner tests use actual 2×2/3×3 crafting containers, player storage, menu-carried stacks and recipe holders, with the absent player/network boundary stubbed. They do not execute packet dispatch or vanilla result consumption. A controller still needs one-use lifecycle tokens (a native menu may be reused after close/reopen), name/ID allocation, asynchronous persistence, reentrant matrix-update handling and delivery. Drop intent is not proof that a cancellable native drop succeeds. No recipe/listener registration, recovery policy or cross-save atomicity is added by this planner.
+This is **not a transaction commit**. Ten native planner/composition tests use actual 2×2/3×3 crafting containers, player storage, menu-carried stacks and recipe holders, with the absent player/network boundary stubbed. They do not execute packet dispatch or vanilla result consumption. A controller still needs one-use lifecycle tokens (a native menu may be reused after close/reopen), wiring of name/ID allocation and asynchronous persistence, reentrant matrix-update handling and delivery. Drop intent is not proof that a cancellable native drop succeeds. No recipe/listener registration, recovery policy or cross-save atomicity is added by this planner.
+
+## Fixed-destination craft delivery (not registered)
+
+`ManualCraftDelivery` can apply a validated plan and exact-sized saved batch to the cursor, selected hotbar/offhand slot or bulk storage destinations. It rechecks current contents before claiming delivery, constructs all sheets first, then debits fresh native input mirrors and places all outputs before triggering one matrix recomputation. This deliberately relies on the pinned Purpur 2618 mirror/count/setter behavior. No further adapter-planned writes occur after the prepare-callback boundary. Existing native setters may send packets; this is not packet-silent or exception/crash-atomic.
+
+Nine native delivery tests cover normal/right-click, bulk and exact-slot delivery, partial ingredient metadata, empty first matrix cells, stale context refusal, mismatched/abandoned/reused batches, reentrancy, callback item changes, new-menu cursor safety and post-callback exceptions. The fixture uses actual containers/cursor stacks and intercepts `slotsChanged`; it does not execute a listening server's recipe manager or event dispatch. A mismatch refuses before consuming cleanup authority; an exception after claiming delivery conservatively retains records rather than replaying or rolling back.
+
+The caller still must contain vanilla consumption, validate a one-use lifecycle/attempt token, schedule on the server thread, pass the player's actual current view and synchronize the appropriate client menu afterward. World-drop plans return `UNSUPPORTED_ROUTE` unchanged in this component; that is not a registered gameplay policy. No completed-craft listener or recipe is exposed yet.
+
+## Q/Ctrl-Q craft delivery (not registered)
+
+Q/Ctrl-Q remain supported scope; no shortcut restriction was accepted or enabled. `ManualDropDelivery` executes saved drop plans one unit at a time, checking original contents minus completed debits before every next unit. `PlayerSheetDrops` creates an unspawned item, dispatches `PlayerDropItemEvent`, revalidates, and uses native `Item.spawnAt` for the cancellable `ItemSpawnEvent` path. It never uses inventory-source dropping or cancellation's return-to-inventory fallback. A successful unit consumes one ingredient set, then recomputes; cancellation stops the suffix without charging it.
+
+Thirteen additional tests cover sequential/bulk/cancelled drops, exact remaining-input validation, stale context, changed/removed entities, same-batch reentry and exceptions. Tests combine real native matrices, serialized sheets, YAML and Paper's event dispatcher; world insertion itself remains an explicit API boundary double, supplemented by pinned-runtime bytecode inspection. No live world or packet dispatch is claimed.
+
+After public callbacks, records are conservatively retained—including unused batch records. Repeated late cancellations can therefore accumulate records. A spawn callback can change inventory after an output escapes but before a safe debit; `UNCONFIRMED` means stop/report without speculative charging, deletion, rollback or replay. This is not arbitrary-plugin/cross-save atomicity. The controller must hold a per-attempt guard across callbacks (including against newly started attempts), revalidate actual current view/lifecycle, and synchronize the client. That controller and recipe registration remain pending.
 
 ## Native equipment adapter
 

src/main/java/games/dmg/fantasystick/crafting/CharacterFactory.java

@@ -0,0 +1,39 @@
+package games.dmg.fantasystick.crafting;
+
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import games.dmg.fantasystick.progression.CharacterProgress;
+import games.dmg.fantasystick.progression.ProgressionRules;
+import java.util.Collections;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+import java.util.function.Supplier;
+import java.util.random.RandomGenerator;
+
+/** Allocation only; invoke for an accepted craft, never for recipe previews or activation. */
+public final class CharacterFactory {
+    private static final String[] GIVEN_NAMES = {"Ari", "Bryn", "Elin", "Finn", "Iris", "Kael", "Mira", "Neris",
+        "Orin", "Rhea", "Soren", "Tala", "Vera", "Wren", "Yara", "Zev"};
+    private static final String[] FAMILY_NAMES = {"Ash", "Birch", "Brook", "Dawn", "Ember", "Fern", "Flint", "Glen",
+        "Hollow", "Lark", "Mist", "Reed", "Stone", "Thorn", "Vale", "Willow"};
+    private final Supplier<UUID> identities;
+    private final RandomGenerator names;
+
+    public CharacterFactory() { this(UUID::randomUUID, RandomGenerator.getDefault()); }
+
+    CharacterFactory(Supplier<UUID> identities, RandomGenerator names) {
+        this.identities = Objects.requireNonNull(identities);
+        this.names = Objects.requireNonNull(names);
+    }
+
+    public synchronized CharacterRecord create(ProgressionRules rules) {
+        Objects.requireNonNull(rules);
+        var initial = new CharacterProgress(identities.get(), rules).snapshot();
+        String name = GIVEN_NAMES[names.nextInt(GIVEN_NAMES.length)] + " "
+            + FAMILY_NAMES[names.nextInt(FAMILY_NAMES.length)];
+        return new CharacterRecord(initial.characterId(), name, initial.revision(), initial.stats(),
+            initial.level(), initial.experience(), initial.unspentPoints(), initial.currentHealth(),
+            Set.of(), Collections.nCopies(7, ""), Map.of(), false, null, null);
+    }
+}

src/main/java/games/dmg/fantasystick/crafting/ManualCraftDelivery.java

@@ -0,0 +1,39 @@
+package games.dmg.fantasystick.crafting;
+
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import org.bukkit.inventory.CraftingInventory;
+import org.bukkit.inventory.InventoryView;
+
+/**
+ * Fixed-destination adapter for the pinned Purpur runtime, not a listener or a portable transaction API.
+ * Call on the server thread after event containment/lifecycle authorization. Supply the player's actual
+ * current open view, never a retained event's view. Close/reopen generations remain the caller's duty.
+ * World drops are deliberately unsupported here. The caller synchronizes the client after completion.
+ */
+public final class ManualCraftDelivery {
+    public enum Result { DELIVERED, STALE, UNAVAILABLE, UNSUPPORTED_ROUTE }
+
+    private ManualCraftDelivery() { }
+
+    public static Result commit(ManualCraftPlan plan, CharacterStorage.CraftBatch batch, InventoryView current) {
+        if (plan.route() == ManualCraftPlan.Route.DROP) return Result.UNSUPPORTED_ROUTE;
+        if (!plan.matches(current)) return Result.STALE;
+        var records = batch.claimForDelivery(plan.quantity());
+        if (records.isEmpty()) return Result.UNAVAILABLE;
+        var sheets = new CharacterSheets();
+        var outputs = records.orElseThrow().stream().map(sheets::create).toList();
+        var grid = (CraftingInventory) current.getTopInventory();
+        var inputs = grid.getMatrix();
+        // Purpur 2618: these are native mirrors; count changes do not call slotsChanged.
+        for (var item : inputs) if (item != null && !item.isEmpty()) item.setAmount(item.getAmount() - plan.quantity());
+        if (plan.route() == ManualCraftPlan.Route.CURSOR) current.setCursor(outputs.getFirst());
+        else for (int index = 0; index < outputs.size(); index++) {
+            current.getBottomInventory().setItem(plan.inventorySlots().get(index), outputs.get(index));
+        }
+        // One adapter-triggered recomputation after ALL debits and placements, including exhausted cells.
+        // Do not make further planned inventory writes after this synchronous callback boundary.
+        grid.setItem(1, inputs[0]);
+        return Result.DELIVERED;
+    }
+}

src/main/java/games/dmg/fantasystick/crafting/ManualCraftPlan.java

@@ -103,25 +103,39 @@ public final class ManualCraftPlan {
      * Never call this from a worker or use an old view to write a new menu's cursor.
      */
     public boolean matches(InventoryView current) {
+        return matches(current, matrix);
+    }
+
+    private boolean matches(InventoryView current, ItemStack[] expected) {
         if (current != view || current.getTopInventory() != grid || current.getBottomInventory() != inventory) return false;
         var recipe = grid.getRecipe();
         return isSheetRecipe(recipe) && Objects.equals(result, recipe.getResult())
-            && Arrays.equals(matrix, copy(grid.getMatrix())) && Objects.equals(result, copy(grid.getResult()))
+            && Arrays.equals(expected, copy(grid.getMatrix())) && Objects.equals(result, copy(grid.getResult()))
             && Objects.equals(cursor, copy(current.getCursor()))
             && inventorySlots.stream().allMatch(slot -> empty(inventory.getItem(slot)));
     }
 
+    /** Revalidate the original drop intent after exactly this many completed units, not a new snapshot. */
+    public boolean matchesAfterDrops(InventoryView current, int completed) {
+        return route == Route.DROP && completed >= 0 && completed < quantity
+            && matches(current, remainingMatrix(completed));
+    }
+
     public int quantity() { return quantity; }
     public Route route() { return route; }
     public List<Integer> inventorySlots() { return inventorySlots; }
 
     public ItemStack[] remainingMatrix() {
+        return remainingMatrix(quantity);
+    }
+
+    private ItemStack[] remainingMatrix(int consumed) {
         var remaining = copy(matrix);
         for (int slot = 0; slot < remaining.length; slot++) {
             var item = remaining[slot];
             if (item != null) {
-                if (item.getAmount() == quantity()) remaining[slot] = null;
-                else item.setAmount(item.getAmount() - quantity());
+                if (item.getAmount() == consumed) remaining[slot] = null;
+                else item.setAmount(item.getAmount() - consumed);
             }
         }
         return remaining;

src/main/java/games/dmg/fantasystick/crafting/ManualDropDelivery.java

@@ -0,0 +1,57 @@
+package games.dmg.fantasystick.crafting;
+
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import org.bukkit.inventory.CraftingInventory;
+import java.util.function.BooleanSupplier;
+import java.util.function.Supplier;
+import org.bukkit.inventory.InventoryView;
+import org.bukkit.inventory.ItemStack;
+
+/**
+ * Server-thread drop executor. The caller owns vanilla containment and a one-use lifecycle/attempt guard,
+ * including refusing NEW attempts during callbacks against these same still-undebited inputs.
+ * UNCONFIRMED means an output may have escaped without a safely authorized debit; stop/report, never replay.
+ * Public callbacks consume the batch's cleanup proof, including any unattempted suffix. This is not atomic
+ * with arbitrary plugin mutations, native insertion failures or Minecraft/file saves.
+ */
+public final class ManualDropDelivery {
+    public enum Status { COMPLETE, CANCELLED, STALE, UNCONFIRMED, UNAVAILABLE, UNSUPPORTED_ROUTE }
+    /** completed counts units with both confirmed insertion and ingredient debit, not every possibly issued sheet. */
+    public record Result(Status status, int completed) { }
+
+    @FunctionalInterface
+    public interface DropTarget {
+        /** COMPLETE means one matching sheet was inserted; callbacks must recheck context before insertion. */
+        Status drop(ItemStack sheet, BooleanSupplier current);
+    }
+
+    private ManualDropDelivery() { }
+
+    public static Result commit(ManualCraftPlan plan, CharacterStorage.CraftBatch batch,
+            Supplier<InventoryView> currentView, BooleanSupplier authorized, DropTarget target) {
+        if (plan.route() != ManualCraftPlan.Route.DROP) return new Result(Status.UNSUPPORTED_ROUTE, 0);
+        BooleanSupplier current = () -> authorized.getAsBoolean() && plan.matchesAfterDrops(currentView.get(), 0);
+        if (!current.getAsBoolean()) return new Result(Status.STALE, 0);
+        var records = batch.claimForDelivery(plan.quantity());
+        if (records.isEmpty()) return new Result(Status.UNAVAILABLE, 0);
+        var sheets = new CharacterSheets();
+        var outputs = records.orElseThrow().stream().map(sheets::create).toList();
+        for (int completed = 0; completed < outputs.size(); completed++) {
+            int expectedCompleted = completed;
+            BooleanSupplier next = () -> authorized.getAsBoolean()
+                && plan.matchesAfterDrops(currentView.get(), expectedCompleted);
+            if (!next.getAsBoolean()) return new Result(Status.STALE, completed);
+            var status = java.util.Objects.requireNonNull(target.drop(outputs.get(completed), next));
+            if (status != Status.COMPLETE) return new Result(status, completed);
+            // A spawn callback may close/replace the menu after an item has escaped. Never charge a stale snapshot.
+            if (!next.getAsBoolean()) return new Result(Status.UNCONFIRMED, completed);
+            var grid = (CraftingInventory) currentView.get().getTopInventory();
+            var inputs = grid.getMatrix();
+            for (var item : inputs) if (item != null && !item.isEmpty()) item.setAmount(item.getAmount() - 1);
+            grid.setItem(1, inputs[0]);
+            // Revalidate against the original plan's expected remaining matrix after this callback boundary.
+        }
+        return new Result(Status.COMPLETE, outputs.size());
+    }
+}

src/main/java/games/dmg/fantasystick/crafting/PlayerSheetDrops.java

@@ -0,0 +1,57 @@
+package games.dmg.fantasystick.crafting;
+
+import games.dmg.fantasystick.items.CharacterSheets;
+import java.util.concurrent.ThreadLocalRandom;
+import java.util.function.BooleanSupplier;
+import java.util.function.Consumer;
+import org.bukkit.entity.Item;
+import org.bukkit.entity.Player;
+import org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason;
+import org.bukkit.event.player.PlayerDropItemEvent;
+import org.bukkit.inventory.ItemStack;
+
+/**
+ * World boundary for saved sheets; no inventory-source drop or cancellation return-to-inventory fallback.
+ * Invoke on the server thread only after the batch claim, since listeners receive a playable identity.
+ * Native spawnAt supplies ItemSpawnEvent; do not dispatch that event separately or infer success from a wrapper.
+ */
+public final class PlayerSheetDrops implements ManualDropDelivery.DropTarget {
+    private final Player player;
+    private final Consumer<PlayerDropItemEvent> events;
+
+    /** events must dispatch synchronously through the server's PluginManager.callEvent in the registered path. */
+    public PlayerSheetDrops(Player player, Consumer<PlayerDropItemEvent> events) {
+        this.player = java.util.Objects.requireNonNull(player);
+        this.events = java.util.Objects.requireNonNull(events);
+    }
+
+    @Override
+    public ManualDropDelivery.Status drop(ItemStack sheet, BooleanSupplier current) {
+        if (sheet == null || sheet.getAmount() != 1 || new CharacterSheets().identify(sheet).isEmpty()) {
+            throw new IllegalArgumentException("Exactly one identified character sheet is required");
+        }
+        if (!current.getAsBoolean()) return ManualDropDelivery.Status.STALE;
+        var location = player.getEyeLocation().subtract(0, .3, 0);
+        var item = location.getWorld().createEntity(location, Item.class);
+        item.setItemStack(sheet.clone());
+        item.setPickupDelay(40);
+        item.setThrower(player.getUniqueId());
+        var random = ThreadLocalRandom.current();
+        double angle = random.nextDouble() * Math.PI * 2;
+        double spread = random.nextDouble() * .02;
+        var velocity = location.getDirection().multiply(.3);
+        velocity.add(new org.bukkit.util.Vector(Math.cos(angle) * spread,
+            .1 + (random.nextDouble() - random.nextDouble()) * .1, Math.sin(angle) * spread));
+        item.setVelocity(velocity);
+        var event = new PlayerDropItemEvent(player, item);
+        events.accept(event);
+        if (item.isInWorld() || item.isValid() || item.isDead() || !sheet.equals(item.getItemStack())) {
+            return ManualDropDelivery.Status.UNCONFIRMED;
+        }
+        if (event.isCancelled()) return ManualDropDelivery.Status.CANCELLED;
+        if (!current.getAsBoolean()) return ManualDropDelivery.Status.STALE;
+        boolean inserted = item.spawnAt(item.getLocation(), SpawnReason.CUSTOM);
+        return inserted && item.isValid() && item.isInWorld() && sheet.equals(item.getItemStack())
+            ? ManualDropDelivery.Status.COMPLETE : ManualDropDelivery.Status.UNCONFIRMED;
+    }
+}

src/main/java/games/dmg/fantasystick/persistence/CharacterStorage.java

@@ -143,6 +143,12 @@ public final class CharacterStorage implements AutoCloseable {
             this.records = created.stream().map(creation -> creation.record).toList();
         }
 
+        /** Reject a wrong-sized batch before giving up its never-issued cleanup proof. */
+        public synchronized Optional<List<CharacterRecord>> claimForDelivery(int expectedQuantity) {
+            if (expectedQuantity < 1 || records.size() != expectedQuantity) return Optional.empty();
+            return claimForDelivery();
+        }
+
         /** One-use handoff immediately before native delivery; an exception afterward cannot authorize deletion. */
         public synchronized Optional<List<CharacterRecord>> claimForDelivery() {
             if (resolved || owner.abandoned) return Optional.empty();

src/main/java/games/dmg/fantasystick/persistence/YamlCharacterRepository.java

@@ -58,7 +58,7 @@ public final class YamlCharacterRepository {
     Creation createTracked(CharacterRecord character) throws IOException {
         if (character.revision().signum() != 0) throw new IOException("New character revision must be zero");
         Creation[] created = new Creation[1];
-        withLock(character.id(), () -> {
+        withLock(() -> {
             if (Files.exists(file(character.id()), LinkOption.NOFOLLOW_LINKS)) {
                 throw new IOException("Character already exists: " + character.id());
             }
@@ -71,7 +71,7 @@ public final class YamlCharacterRepository {
         if (!character.revision().equals(expectedRevision.add(BigInteger.ONE))) {
             throw new IOException("Character update must advance exactly one revision");
         }
-        withLock(character.id(), () -> {
+        withLock(() -> {
             CharacterRecord current = load(character.id()).orElseThrow(() -> new IOException("Character not found"));
             if (!current.revision().equals(expectedRevision)) throw new IOException("Stale character revision");
             write(character);
@@ -81,7 +81,7 @@ public final class YamlCharacterRepository {
     /** Only the in-memory creator of a never-issued batch may request this cleanup. */
     boolean discardUnissued(Creation created) throws IOException {
         boolean[] removed = {false};
-        withLock(created.record.id(), () -> {
+        withLock(() -> {
             var path = file(created.record.id());
             if (Files.notExists(path, LinkOption.NOFOLLOW_LINKS)) {
                 removed[0] = true;
@@ -138,9 +138,10 @@ public final class YamlCharacterRepository {
         }
     }
 
-    private void withLock(UUID id, Operation operation) throws IOException {
+    /** Bounded coordination for all mutations; never mix with older per-ID writers in this directory. */
+    private void withLock(Operation operation) throws IOException {
         Files.createDirectories(directory);
-        Path lockPath = directory.resolve(id + ".lock");
+        Path lockPath = directory.resolve(".records.lock");
         try (var channel = FileChannel.open(lockPath, StandardOpenOption.CREATE, StandardOpenOption.WRITE,
                 LinkOption.NOFOLLOW_LINKS);
              var lock = channel.tryLock()) {

src/nativeTest/java/games/dmg/fantasystick/ManualCraftDeliveryNativeTest.java

@@ -0,0 +1,261 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.crafting.CharacterFactory;
+import games.dmg.fantasystick.crafting.ManualCraftDelivery;
+import games.dmg.fantasystick.crafting.ManualCraftPlan;
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.persistence.YamlCharacterRepository;
+import games.dmg.fantasystick.progression.ProgressionRules;
+import java.nio.file.Path;
+import java.time.Clock;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
+import org.bukkit.event.inventory.ClickType;
+import org.bukkit.event.inventory.InventoryAction;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class ManualCraftDeliveryNativeTest {
+    @Test
+    void shiftCraftPlacesDistinctSheetsInPlannedSlotsAndPreservesPartialInputMetadataAndCursor() throws Exception {
+        for (int width : new int[] {2, 3}) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(width, 4);
+            var inputs = fixture.grid.getMatrix();
+            var arranged = new org.bukkit.inventory.ItemStack[width * width];
+            for (int index = 0; index < 4; index++) {
+                var meta = inputs[index].getItemMeta();
+                meta.displayName(net.kyori.adventure.text.Component.text("Named ingredient"));
+                inputs[index].setItemMeta(meta);
+                arranged[width == 2 ? index : 8 - index * 2] = inputs[index];
+            }
+            fixture.grid.setMatrix(arranged);
+            for (int slot = 0; slot < 36; slot++) fixture.inventory.setItem(slot,
+                new org.bukkit.inventory.ItemStack(org.bukkit.Material.COBBLESTONE, 64));
+            fixture.inventory.setItem(8, null);
+            fixture.inventory.setItem(33, null);
+            fixture.view.setCursor(new org.bukkit.inventory.ItemStack(org.bukkit.Material.DIAMOND, 29));
+            var plan = ManualCraftPlan.capture(fixture.event(ClickType.SHIFT_LEFT,
+                InventoryAction.MOVE_TO_OTHER_INVENTORY)).orElseThrow();
+            assertEquals(List.of(8, 33), plan.inventorySlots());
+            var factory = new CharacterFactory();
+            var records = java.util.stream.IntStream.range(0, plan.quantity())
+                .mapToObj(index -> factory.create(ProgressionRules.defaults())).toList();
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var batch = storage.prepareCraft(records).ready().join();
+                var changes = new AtomicInteger();
+                fixture.menu.onChange = () -> {
+                    changes.incrementAndGet();
+                    for (var item : fixture.grid.getMatrix()) if (item != null && !item.isEmpty()) {
+                        assertEquals(2, item.getAmount());
+                        assertEquals(net.kyori.adventure.text.Component.text("Named ingredient"), item.getItemMeta().displayName());
+                    }
+                    for (int index = 0; index < records.size(); index++) assertEquals(records.get(index).id(),
+                        new CharacterSheets().identify(fixture.inventory.getItem(plan.inventorySlots().get(index))).orElseThrow());
+                };
+                assertEquals(ManualCraftDelivery.Result.DELIVERED, ManualCraftDelivery.commit(plan, batch, fixture.view));
+                assertEquals(1, changes.get());
+                assertFalse(fixture.inventory.getItem(8).isSimilar(fixture.inventory.getItem(33)));
+                assertEquals(64, fixture.inventory.getItem(12).getAmount());
+                assertEquals(org.bukkit.Material.COBBLESTONE, fixture.inventory.getItem(12).getType());
+                assertEquals(org.bukkit.Material.DIAMOND, fixture.view.getCursor().getType());
+                assertEquals(29, fixture.view.getCursor().getAmount());
+            }
+        }
+    }
+
+    @Test
+    void mismatchedSavedBatchDoesNotConsumeAnythingOrClaimDelivery() throws Exception {
+        for (int quantity : new int[] {1, 3}) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(2, 2);
+            var plan = ManualCraftPlan.capture(fixture.event(ClickType.SHIFT_LEFT,
+                InventoryAction.MOVE_TO_OTHER_INVENTORY)).orElseThrow();
+            var factory = new CharacterFactory();
+            var records = java.util.stream.IntStream.range(0, quantity)
+                .mapToObj(index -> factory.create(ProgressionRules.defaults())).toList();
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var attempt = storage.prepareCraft(records);
+                var batch = attempt.ready().join();
+                assertEquals(ManualCraftDelivery.Result.UNAVAILABLE, ManualCraftDelivery.commit(plan, batch, fixture.view));
+                assertEquals(2, fixture.grid.getMatrix()[0].getAmount());
+                assertNull(fixture.inventory.getItem(8));
+                assertEquals(quantity, attempt.abandon().join().removed().size(),
+                    "An invalid batch must remain provably unissued and cleanable");
+            }
+        }
+    }
+
+    @Test
+    void numberAndOffhandDeliveryChangeOnlyTheExactDestinationAndPreserveTheCursor() throws Exception {
+        for (int slot : new int[] {0, 8, 40}) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(3, 2);
+            fixture.view.setCursor(new org.bukkit.inventory.ItemStack(org.bukkit.Material.DIAMOND, 3));
+            var event = new org.bukkit.event.inventory.CraftItemEvent(new CharacterSheets().recipe(), fixture.view,
+                org.bukkit.event.inventory.InventoryType.SlotType.RESULT, 0,
+                slot == 40 ? ClickType.SWAP_OFFHAND : ClickType.NUMBER_KEY, InventoryAction.HOTBAR_SWAP,
+                slot == 40 ? -1 : slot);
+            var plan = ManualCraftPlan.capture(event).orElseThrow();
+            var record = new CharacterFactory().create(ProgressionRules.defaults());
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var batch = storage.prepareCraft(List.of(record)).ready().join();
+                assertEquals(ManualCraftDelivery.Result.DELIVERED, ManualCraftDelivery.commit(plan, batch, fixture.view));
+                assertEquals(record.id(), new CharacterSheets().identify(fixture.inventory.getItem(slot)).orElseThrow());
+                assertEquals(1, fixture.grid.getMatrix()[0].getAmount());
+                assertEquals(org.bukkit.Material.DIAMOND, fixture.view.getCursor().getType());
+                assertEquals(3, fixture.view.getCursor().getAmount());
+            }
+        }
+    }
+
+    @Test
+    void staleInputsDestinationsRecipeCursorOrViewLeaveAllCurrentItemsAndCleanupProofUntouched() throws Exception {
+        for (int scenario = 0; scenario < 5; scenario++) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(2, 2);
+            var plan = ManualCraftPlan.capture(fixture.event(ClickType.SHIFT_LEFT,
+                InventoryAction.MOVE_TO_OTHER_INVENTORY)).orElseThrow();
+            var factory = new CharacterFactory();
+            var records = List.of(factory.create(ProgressionRules.defaults()), factory.create(ProgressionRules.defaults()));
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var attempt = storage.prepareCraft(records);
+                var batch = attempt.ready().join();
+                if (scenario == 0) fixture.grid.getMatrix()[0].setAmount(7);
+                if (scenario == 1) fixture.inventory.setItem(8, new org.bukkit.inventory.ItemStack(org.bukkit.Material.DIAMOND));
+                if (scenario == 2) fixture.matrix.setCurrentRecipe(null);
+                if (scenario == 3) fixture.view.setCursor(new org.bukkit.inventory.ItemStack(org.bukkit.Material.GOLD_INGOT));
+                var current = scenario == 4 ? new ManualCraftPlanNativeTest.Fixture(2, 2).view : fixture.view;
+                var inputBefore = copy(fixture.grid.getMatrix());
+                var inventoryBefore = copy(fixture.inventory.getContents());
+                var cursorBefore = fixture.view.getCursor().clone();
+                fixture.menu.onChange = () -> fail("A refused craft must not recompute or mutate");
+                assertEquals(ManualCraftDelivery.Result.STALE, ManualCraftDelivery.commit(plan, batch, current));
+                assertArrayEquals(inputBefore, fixture.grid.getMatrix());
+                assertArrayEquals(inventoryBefore, fixture.inventory.getContents());
+                assertEquals(cursorBefore, fixture.view.getCursor());
+                assertEquals(2, attempt.abandon().join().removed().size());
+            }
+        }
+    }
+
+    @Test
+    void recomputationCanReenterAndChangeItemsWithoutASecondDeliveryOrLaterOverwrite() throws Exception {
+        var fixture = new ManualCraftPlanNativeTest.Fixture(2, 2);
+        var plan = ManualCraftPlan.capture(new org.bukkit.event.inventory.CraftItemEvent(new CharacterSheets().recipe(),
+            fixture.view, org.bukkit.event.inventory.InventoryType.SlotType.RESULT, 0, ClickType.NUMBER_KEY,
+            InventoryAction.HOTBAR_SWAP, 8)).orElseThrow();
+        var record = new CharacterFactory().create(ProgressionRules.defaults());
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+            var attempt = storage.prepareCraft(List.of(record));
+            var batch = attempt.ready().join();
+            var changes = new AtomicInteger();
+            fixture.menu.onChange = () -> {
+                assertEquals(1, changes.incrementAndGet());
+                assertEquals(record.id(), new CharacterSheets().identify(fixture.inventory.getItem(8)).orElseThrow());
+                var repeat = ManualCraftPlan.capture(new org.bukkit.event.inventory.CraftItemEvent(new CharacterSheets().recipe(),
+                    fixture.view, org.bukkit.event.inventory.InventoryType.SlotType.RESULT, 0, ClickType.NUMBER_KEY,
+                    InventoryAction.HOTBAR_SWAP, 7)).orElseThrow();
+                assertEquals(ManualCraftDelivery.Result.UNAVAILABLE, ManualCraftDelivery.commit(repeat, batch, fixture.view));
+                assertNull(fixture.inventory.getItem(7));
+                // A post-commit listener owns these later changes; never rewrite a stored snapshot over them.
+                fixture.inventory.setItem(8, new org.bukkit.inventory.ItemStack(org.bukkit.Material.DIAMOND));
+                fixture.grid.getMatrix()[2].setAmount(22);
+            };
+            assertEquals(ManualCraftDelivery.Result.DELIVERED, ManualCraftDelivery.commit(plan, batch, fixture.view));
+            assertEquals(org.bukkit.Material.DIAMOND, fixture.inventory.getItem(8).getType());
+            assertEquals(22, fixture.grid.getMatrix()[2].getAmount());
+            assertEquals(1, changes.get());
+            assertEquals(java.util.Set.of(record.id()), attempt.abandon().join().retained());
+        }
+    }
+
+    @Test
+    void abandonedBatchAndUnsupportedWorldDropDoNotChangeInputsOrDestinations() throws Exception {
+        for (boolean drop : new boolean[] {false, true}) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(2, 1);
+            var plan = ManualCraftPlan.capture(fixture.event(drop ? ClickType.DROP : ClickType.LEFT,
+                drop ? InventoryAction.DROP_ONE_SLOT : InventoryAction.PICKUP_ALL)).orElseThrow();
+            var record = new CharacterFactory().create(ProgressionRules.defaults());
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var attempt = storage.prepareCraft(List.of(record));
+                var batch = attempt.ready().join();
+                if (!drop) attempt.abandon();
+                assertEquals(drop ? ManualCraftDelivery.Result.UNSUPPORTED_ROUTE : ManualCraftDelivery.Result.UNAVAILABLE,
+                    ManualCraftDelivery.commit(plan, batch, fixture.view));
+                assertEquals(1, fixture.grid.getMatrix()[0].getAmount());
+                assertTrue(fixture.view.getCursor().isEmpty());
+                assertEquals(java.util.Set.of(record.id()), attempt.abandon().join().removed());
+            }
+        }
+    }
+
+    @Test
+    void aMenuChangeDuringRecomputationDoesNotWriteIntoTheNewMenusCursor() throws Exception {
+        var fixture = new ManualCraftPlanNativeTest.Fixture(2, 1);
+        var plan = ManualCraftPlan.capture(fixture.event(ClickType.RIGHT, InventoryAction.PICKUP_HALF)).orElseThrow();
+        var record = new CharacterFactory().create(ProgressionRules.defaults());
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+            var batch = storage.prepareCraft(List.of(record)).ready().join();
+            fixture.menu.onChange = () -> {
+                fixture.activeMenu = new ManualCraftPlanNativeTest.Menu();
+                fixture.view.setCursor(new org.bukkit.inventory.ItemStack(org.bukkit.Material.DIAMOND));
+            };
+            assertEquals(ManualCraftDelivery.Result.DELIVERED, ManualCraftDelivery.commit(plan, batch, fixture.view));
+            assertEquals(org.bukkit.Material.DIAMOND, fixture.view.getCursor().getType());
+            assertEquals(record.id(), new CharacterSheets().identify(
+                org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(fixture.menu.getCarried())).orElseThrow());
+        }
+    }
+
+    @Test
+    void anExceptionAfterRecomputationBeginsNeverAuthorizesDeletionOrInventoryRollback() throws Exception {
+        var fixture = new ManualCraftPlanNativeTest.Fixture(2, 1);
+        var plan = ManualCraftPlan.capture(fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL)).orElseThrow();
+        var record = new CharacterFactory().create(ProgressionRules.defaults());
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+            var attempt = storage.prepareCraft(List.of(record));
+            var batch = attempt.ready().join();
+            fixture.menu.onChange = () -> { throw new IllegalStateException("Simulated post-commit callback failure"); };
+            assertThrows(IllegalStateException.class, () -> ManualCraftDelivery.commit(plan, batch, fixture.view));
+            assertEquals(record.id(), new CharacterSheets().identify(fixture.view.getCursor()).orElseThrow());
+            assertTrue(fixture.grid.getMatrix()[0] == null || fixture.grid.getMatrix()[0].isEmpty());
+            assertEquals(java.util.Set.of(record.id()), attempt.abandon().join().retained());
+            assertEquals(record, storage.find(record.id()).join().orElseThrow());
+        }
+    }
+
+    private static org.bukkit.inventory.ItemStack[] copy(org.bukkit.inventory.ItemStack[] items) {
+        return java.util.Arrays.stream(items).map(item -> item == null ? null : item.clone())
+            .toArray(org.bukkit.inventory.ItemStack[]::new);
+    }
+
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test
+    void cursorCraftDebitsOneIngredientSetAndDeliversTheSavedSheetBeforeOneRecomputation() throws Exception {
+        for (int width : new int[] {2, 3}) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(width, 1);
+            var plan = ManualCraftPlan.capture(fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL)).orElseThrow();
+            var character = new CharacterFactory().create(ProgressionRules.defaults());
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var batch = storage.prepareCraft(List.of(character)).ready().join();
+                var changes = new AtomicInteger();
+                fixture.menu.onChange = () -> {
+                    changes.incrementAndGet();
+                    assertTrue(java.util.Arrays.stream(fixture.grid.getMatrix()).allMatch(item -> item == null || item.isEmpty()),
+                        "A prepare callback must not observe a partially debited ingredient set");
+                    assertEquals(character.id(), new CharacterSheets().identify(fixture.view.getCursor()).orElseThrow(),
+                        "The final output must exist before recomputation callbacks run");
+                };
+                assertEquals(ManualCraftDelivery.Result.DELIVERED, ManualCraftDelivery.commit(plan, batch, fixture.view));
+                assertEquals(1, changes.get());
+                assertEquals(character.id(), new CharacterSheets().identify(fixture.view.getCursor()).orElseThrow());
+                assertEquals(character, storage.find(character.id()).join().orElseThrow());
+                assertNotEquals(ManualCraftDelivery.Result.DELIVERED, ManualCraftDelivery.commit(plan, batch, fixture.view));
+                assertEquals(1, changes.get(), "Duplicate completion must not debit or notify again");
+            }
+        }
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/ManualCraftPlanNativeTest.java

@@ -224,8 +224,68 @@ class ManualCraftPlanNativeTest {
         assertEquals(2, fixture.grid.getResult().getAmount());
     }
 
-    private static final class Fixture {
+    @Test
+    void plannedBatchCanPersistAndRenderDistinctNamedSheetsWithoutApplyingInventoryChanges(
+            @org.junit.jupiter.api.io.TempDir java.nio.file.Path data) throws Exception {
+        var fixture = new Fixture(3, 4);
+        var plan = ManualCraftPlan.capture(fixture.event(ClickType.SHIFT_LEFT,
+            InventoryAction.MOVE_TO_OTHER_INVENTORY)).orElseThrow();
+        var factory = new games.dmg.fantasystick.crafting.CharacterFactory();
+        var records = java.util.stream.IntStream.range(0, plan.quantity())
+            .mapToObj(index -> factory.create(games.dmg.fantasystick.progression.ProgressionRules.defaults())).toList();
+        var repository = new games.dmg.fantasystick.persistence.YamlCharacterRepository(data);
+        try (var storage = new games.dmg.fantasystick.persistence.CharacterStorage(repository, java.time.Clock.systemUTC())) {
+            var batch = storage.prepareCraft(records).ready().join(); // Test thread, never the runtime tick thread.
+            assertTrue(plan.matches(fixture.view));
+            var saved = batch.claimForDelivery().orElseThrow();
+            var identities = new java.util.HashSet<java.util.UUID>();
+            var sheets = new CharacterSheets();
+            var ops = net.minecraft.resources.RegistryOps.create(net.minecraft.nbt.NbtOps.INSTANCE,
+                org.bukkit.craftbukkit.CraftRegistry.getMinecraftRegistry());
+            for (var record : saved) {
+                assertEquals(record, storage.find(record.id()).join().orElseThrow());
+                var sheet = sheets.create(record);
+                var encoded = net.minecraft.world.item.ItemStack.CODEC.encodeStart(ops,
+                    CraftItemStack.asNMSCopy(sheet)).getOrThrow();
+                var decoded = CraftItemStack.asBukkitCopy(net.minecraft.world.item.ItemStack.CODEC.parse(ops, encoded).getOrThrow());
+                assertTrue(identities.add(sheets.identify(decoded).orElseThrow()));
+                assertEquals(net.kyori.adventure.text.Component.text(record.name()), decoded.getItemMeta().displayName());
+                assertEquals(1, decoded.getAmount());
+                assertEquals(record, repository.load(record.id()).orElseThrow());
+            }
+            assertEquals(plan.quantity(), identities.size());
+            assertEquals(4, fixture.grid.getMatrix()[0].getAmount(), "This composition test does not commit a native craft");
+            assertNull(fixture.inventory.getItem(8));
+            assertTrue(sheets.identify(fixture.grid.getResult()).isEmpty());
+            assertTrue(batch.claimForDelivery().isEmpty());
+        }
+    }
+
+    @Test
+    void bulkDropRevalidationAcceptsOnlyTheExpectedRemainingInputsBeforeEachNextUnit() {
+        for (int width : new int[] {2, 3}) {
+            var fixture = new Fixture(width, 3);
+            var plan = ManualCraftPlan.capture(fixture.event(ClickType.CONTROL_DROP, InventoryAction.DROP_ALL_SLOT)).orElseThrow();
+            assertTrue(plan.matchesAfterDrops(fixture.view, 0));
+            for (int completed = 1; completed < 3; completed++) {
+                for (var item : fixture.grid.getMatrix()) if (item != null && !item.isEmpty()) item.setAmount(item.getAmount() - 1);
+                assertTrue(plan.matchesAfterDrops(fixture.view, completed));
+                assertFalse(plan.matchesAfterDrops(fixture.view, completed - 1));
+                assertFalse(plan.matches(fixture.view));
+            }
+            fixture.grid.getMatrix()[0].setAmount(2);
+            assertFalse(plan.matchesAfterDrops(fixture.view, 2), "Do not recapture unrelated callback changes as new authorized input");
+            assertFalse(plan.matchesAfterDrops(fixture.view, -1));
+            assertFalse(plan.matchesAfterDrops(fixture.view, 3));
+            var cursor = new Fixture(width, 3);
+            var cursorPlan = ManualCraftPlan.capture(cursor.event(ClickType.LEFT, InventoryAction.PICKUP_ALL)).orElseThrow();
+            assertFalse(cursorPlan.matchesAfterDrops(cursor.view, 0));
+        }
+    }
+
+    static final class Fixture {
         final Menu menu = new Menu();
+        Menu activeMenu = menu;
         final TransientCraftingContainer matrix;
         final CraftInventoryCrafting grid;
         final CraftInventoryPlayer inventory = new CraftInventoryPlayer(
@@ -244,8 +304,8 @@ class ManualCraftPlanNativeTest {
                 @Override public CraftInventoryPlayer getBottomInventory() { return inventory; }
                 @Override public HumanEntity getPlayer() { throw new AssertionError("Unexpected player/network access"); }
                 @Override public InventoryType getType() { return grid.getType(); }
-                @Override public ItemStack getCursor() { return CraftItemStack.asCraftMirror(menu.getCarried()); }
-                @Override public void setCursor(ItemStack item) { menu.setCarried(CraftItemStack.asNMSCopy(item)); }
+                @Override public ItemStack getCursor() { return CraftItemStack.asCraftMirror(activeMenu.getCarried()); }
+                @Override public void setCursor(ItemStack item) { activeMenu.setCarried(CraftItemStack.asNMSCopy(item)); }
                 @Override public String getTitle() { return "Crafting fixture"; }
                 @Override public String getOriginalTitle() { return getTitle(); }
                 @Override public void setTitle(String title) { throw new AssertionError("Unexpected title change"); }
@@ -277,14 +337,15 @@ class ManualCraftPlanNativeTest {
         }
     }
 
-    private static final class Menu extends AbstractContainerMenu {
+    static final class Menu extends AbstractContainerMenu {
         InventoryView view;
+        Runnable onChange = () -> { };
         Menu() { super(null, 0); }
         @Override public InventoryView getBukkitView() { return view; }
         @Override public boolean stillValid(net.minecraft.world.entity.player.Player player) { return true; }
         @Override public net.minecraft.world.item.ItemStack quickMoveStack(net.minecraft.world.entity.player.Player player, int slot) {
             throw new AssertionError("This fixture does not execute vanilla result consumption");
         }
-        @Override public void slotsChanged(net.minecraft.world.Container inventory) { }
+        @Override public void slotsChanged(net.minecraft.world.Container inventory) { onChange.run(); }
     }
 }

src/nativeTest/java/games/dmg/fantasystick/ManualDropDeliveryNativeTest.java

@@ -0,0 +1,188 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.crafting.CharacterFactory;
+import games.dmg.fantasystick.crafting.ManualCraftPlan;
+import games.dmg.fantasystick.crafting.ManualDropDelivery;
+import games.dmg.fantasystick.crafting.ManualDropDelivery.Status;
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.persistence.YamlCharacterRepository;
+import games.dmg.fantasystick.progression.ProgressionRules;
+import java.nio.file.Path;
+import java.time.Clock;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
+import org.bukkit.event.inventory.ClickType;
+import org.bukkit.event.inventory.InventoryAction;
+import org.bukkit.inventory.ItemStack;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+/** Real matrix/item/persistence boundaries; DropTarget is the external world-insertion seam, not a live world. */
+class ManualDropDeliveryNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test
+    void ctrlQCompletesDistinctUnitsAndStopsAtCancellationWithoutChargingTheCancelledUnit() throws Exception {
+        for (int cancelAfter : new int[] {0, 2, 4}) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(3, 4);
+            var plan = ManualCraftPlan.capture(fixture.event(ClickType.CONTROL_DROP, InventoryAction.DROP_ALL_SLOT)).orElseThrow();
+            var factory = new CharacterFactory();
+            var records = java.util.stream.IntStream.range(0, 4).mapToObj(index -> factory.create(ProgressionRules.defaults())).toList();
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var attempt = storage.prepareCraft(records);
+                var batch = attempt.ready().join();
+                var outputs = new ArrayList<ItemStack>();
+                var changes = new AtomicInteger();
+                var calls = new AtomicInteger();
+                fixture.menu.onChange = () -> changes.incrementAndGet();
+                var result = ManualDropDelivery.commit(plan, batch, () -> fixture.view, () -> true, (sheet, current) -> {
+                    calls.incrementAndGet();
+                    assertTrue(current.getAsBoolean());
+                    assertEquals(4 - outputs.size(), fixture.grid.getMatrix()[0].getAmount());
+                    if (outputs.size() == cancelAfter) return Status.CANCELLED;
+                    outputs.add(ItemStack.deserializeBytes(sheet.serializeAsBytes()));
+                    return Status.COMPLETE;
+                });
+                assertEquals(new ManualDropDelivery.Result(cancelAfter == 4 ? Status.COMPLETE : Status.CANCELLED, cancelAfter), result);
+                assertEquals(Math.min(4, cancelAfter + 1), calls.get());
+                assertEquals(cancelAfter, changes.get());
+                var first = fixture.grid.getMatrix()[0];
+                assertEquals(4 - cancelAfter, first == null ? 0 : first.getAmount());
+                assertEquals(records.subList(0, cancelAfter).stream().map(record -> record.id()).toList(),
+                    outputs.stream().map(item -> new CharacterSheets().identify(item).orElseThrow()).toList());
+                assertEquals(cancelAfter, outputs.stream().map(item -> new CharacterSheets().identify(item).orElseThrow()).distinct().count());
+                assertEquals(4, attempt.abandon().join().retained().size(), "Never delete records after public drop callbacks may have exposed sheets");
+            }
+        }
+    }
+
+    @Test
+    void refusedAttemptsNeverReachTheWorldOrConsumeCleanupAuthority() throws Exception {
+        for (int scenario = 0; scenario < 5; scenario++) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(2, 2);
+            var plan = ManualCraftPlan.capture(fixture.event(scenario == 4 ? ClickType.LEFT : ClickType.CONTROL_DROP,
+                scenario == 4 ? InventoryAction.PICKUP_ALL : InventoryAction.DROP_ALL_SLOT)).orElseThrow();
+            var factory = new CharacterFactory();
+            var records = java.util.stream.IntStream.range(0, scenario == 2 ? 1 : 2)
+                .mapToObj(index -> factory.create(ProgressionRules.defaults())).toList();
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var attempt = storage.prepareCraft(records);
+                var batch = attempt.ready().join();
+                if (scenario == 0) fixture.grid.getMatrix()[0].setAmount(7);
+                if (scenario == 3) attempt.abandon();
+                boolean allowed = scenario != 1;
+                var result = ManualDropDelivery.commit(plan, batch, () -> fixture.view, () -> allowed,
+                    (sheet, current) -> { fail("A refused attempt must not reach the world"); return Status.COMPLETE; });
+                assertEquals(scenario < 2 ? Status.STALE : scenario == 4 ? Status.UNSUPPORTED_ROUTE : Status.UNAVAILABLE, result.status());
+                assertEquals(0, result.completed());
+                assertEquals(scenario == 0 ? 7 : 2, fixture.grid.getMatrix()[0].getAmount());
+                assertEquals(records.size(), attempt.abandon().join().removed().size());
+            }
+        }
+    }
+
+    @Test
+    void callbackChangesStopBulkWithoutChargingNewContentsOrRewritingTheNewCursor() throws Exception {
+        for (boolean duringSpawn : new boolean[] {true, false}) {
+            for (int mutation = 0; mutation < 4; mutation++) {
+                var fixture = new ManualCraftPlanNativeTest.Fixture(2, 3);
+                var plan = ManualCraftPlan.capture(fixture.event(ClickType.CONTROL_DROP, InventoryAction.DROP_ALL_SLOT)).orElseThrow();
+                var factory = new CharacterFactory();
+                var records = java.util.stream.IntStream.range(0, 3).mapToObj(index -> factory.create(ProgressionRules.defaults())).toList();
+                var view = new java.util.concurrent.atomic.AtomicReference<org.bukkit.inventory.InventoryView>(fixture.view);
+                var authorized = new java.util.concurrent.atomic.AtomicBoolean(true);
+                int change = mutation;
+                Runnable mutate = () -> {
+                    if (change == 0) fixture.grid.getMatrix()[0].setAmount(7);
+                    if (change == 1) fixture.view.setCursor(new ItemStack(org.bukkit.Material.DIAMOND));
+                    if (change == 2) view.set(new ManualCraftPlanNativeTest.Fixture(2, 3).view);
+                    if (change == 3) authorized.set(false); // Same-menu close/reopen is not detected by contents alone.
+                };
+                var calls = new AtomicInteger();
+                if (!duringSpawn) fixture.menu.onChange = mutate;
+                try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                    var attempt = storage.prepareCraft(records);
+                    var result = ManualDropDelivery.commit(plan, attempt.ready().join(), view::get, authorized::get, (sheet, current) -> {
+                        assertEquals(1, calls.incrementAndGet());
+                        assertTrue(current.getAsBoolean());
+                        if (duringSpawn) mutate.run();
+                        return Status.COMPLETE;
+                    });
+                    assertEquals(new ManualDropDelivery.Result(duringSpawn ? Status.UNCONFIRMED : Status.STALE, duringSpawn ? 0 : 1), result);
+                    assertEquals(change == 0 ? 7 : duringSpawn ? 3 : 2, fixture.grid.getMatrix()[0].getAmount());
+                    if (change == 1) assertEquals(org.bukkit.Material.DIAMOND, fixture.view.getCursor().getType());
+                    assertEquals(3, attempt.abandon().join().retained().size());
+                }
+            }
+        }
+    }
+
+    @Test
+    void repeatedReentrantAndExceptionalCompletionsNeverReuseABatchOrDeletePossiblyIssuedRecords() throws Exception {
+        for (int failure : new int[] {0, 1, 2}) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(2, 2);
+            var plan = ManualCraftPlan.capture(fixture.event(ClickType.DROP, InventoryAction.DROP_ONE_SLOT)).orElseThrow();
+            var record = new CharacterFactory().create(ProgressionRules.defaults());
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var attempt = storage.prepareCraft(List.of(record));
+                var batch = attempt.ready().join();
+                var calls = new AtomicInteger();
+                int mode = failure;
+                if (mode == 2) fixture.menu.onChange = () -> { throw new IllegalStateException("prepare failure"); };
+                ManualDropDelivery.DropTarget target = (sheet, current) -> {
+                    assertEquals(1, calls.incrementAndGet());
+                    var reentrant = ManualDropDelivery.commit(plan, batch, () -> fixture.view, () -> true,
+                        (other, valid) -> { fail("Batch replay reached world insertion"); return Status.COMPLETE; });
+                    assertEquals(Status.UNAVAILABLE, reentrant.status());
+                    if (mode == 1) throw new IllegalStateException("drop failure");
+                    return Status.COMPLETE;
+                };
+                if (mode == 0) assertEquals(Status.COMPLETE,
+                    ManualDropDelivery.commit(plan, batch, () -> fixture.view, () -> true, target).status());
+                else assertThrows(IllegalStateException.class,
+                    () -> ManualDropDelivery.commit(plan, batch, () -> fixture.view, () -> true, target));
+                assertEquals(mode == 1 ? 2 : 1, fixture.grid.getMatrix()[0].getAmount());
+                assertEquals(1, attempt.abandon().join().retained().size());
+                assertNotEquals(Status.COMPLETE, ManualDropDelivery.commit(plan, batch, () -> fixture.view, () -> true, target).status());
+                assertEquals(1, calls.get());
+            }
+        }
+    }
+
+    @Test
+    void qCraftDropsOneSavedSheetAndDebitsExactlyOneSetBeforeRecomputation() throws Exception {
+        for (int width : new int[] {2, 3}) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(width, 3);
+            var plan = ManualCraftPlan.capture(fixture.event(ClickType.DROP, InventoryAction.DROP_ONE_SLOT)).orElseThrow();
+            var record = new CharacterFactory().create(ProgressionRules.defaults());
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var batch = storage.prepareCraft(List.of(record)).ready().join();
+                var outputs = new ArrayList<ItemStack>();
+                var changes = new AtomicInteger();
+                fixture.menu.onChange = () -> {
+                    changes.incrementAndGet();
+                    assertEquals(1, outputs.size());
+                    assertEquals(2, fixture.grid.getMatrix()[0].getAmount());
+                };
+                var result = ManualDropDelivery.commit(plan, batch, () -> fixture.view, () -> true, (sheet, current) -> {
+                    assertTrue(current.getAsBoolean());
+                    assertEquals(3, fixture.grid.getMatrix()[0].getAmount(), "Do not debit before cancellable drop callbacks");
+                    outputs.add(ItemStack.deserializeBytes(sheet.serializeAsBytes()));
+                    return Status.COMPLETE;
+                });
+                assertEquals(new ManualDropDelivery.Result(Status.COMPLETE, 1), result);
+                assertEquals(record.id(), new CharacterSheets().identify(outputs.getFirst()).orElseThrow());
+                assertEquals(record, storage.find(record.id()).join().orElseThrow());
+                assertEquals(1, changes.get());
+                assertTrue(fixture.view.getCursor().isEmpty());
+                assertNull(fixture.inventory.getItem(8));
+            }
+        }
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/PlayerSheetDropsNativeTest.java

@@ -0,0 +1,262 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.crafting.CharacterFactory;
+import games.dmg.fantasystick.crafting.ManualDropDelivery.Status;
+import games.dmg.fantasystick.crafting.PlayerSheetDrops;
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.progression.ProgressionRules;
+import java.lang.reflect.Proxy;
+import java.util.UUID;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.Consumer;
+import org.bukkit.Location;
+import org.bukkit.World;
+import org.bukkit.entity.Item;
+import org.bukkit.entity.Player;
+import org.bukkit.event.entity.ItemSpawnEvent;
+import org.bukkit.event.player.PlayerDropItemEvent;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.util.Vector;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+/** Real native sheet data and API events; world insertion/player are explicit boundary doubles, not a live server. */
+class PlayerSheetDropsNativeTest {
+    @org.junit.jupiter.api.io.TempDir java.nio.file.Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test
+    void publishesOnePlayerDropEventBeforeNativeSpawningWithARealSavedSheetAndPlayerDropDefaults() {
+        var fixture = new WorldFixture();
+        var sheet = sheet();
+        var events = new AtomicInteger();
+        var drops = new PlayerSheetDrops(fixture.player, event -> {
+            events.incrementAndGet();
+            assertSame(fixture.player, event.getPlayer());
+            assertEquals(sheet, event.getItemDrop().getItemStack());
+            assertFalse(event.getItemDrop().isInWorld());
+            assertEquals(0, fixture.spawnCalls);
+        });
+        assertEquals(Status.COMPLETE, drops.drop(sheet, () -> true));
+        assertEquals(1, events.get());
+        assertEquals(1, fixture.spawnCalls);
+        assertEquals(1, fixture.spawnEvents);
+        assertEquals(sheet, fixture.stack);
+        assertEquals(fixture.playerId, fixture.thrower);
+        assertEquals(40, fixture.pickupDelay);
+        assertEquals(65.32, fixture.location.getY(), 0.00001);
+        assertTrue(Math.abs(fixture.velocity.getX()) <= .02);
+        assertTrue(fixture.velocity.getY() >= 0 && fixture.velocity.getY() <= .2);
+        assertTrue(fixture.velocity.getZ() >= .28 && fixture.velocity.getZ() <= .32);
+    }
+
+    @Test
+    void aCancelledPlayerDropNeverSpawnsOrUsesTheNativeInventoryReturnFallback() {
+        var fixture = new WorldFixture();
+        var drops = new PlayerSheetDrops(fixture.player, event -> event.setCancelled(true));
+        assertEquals(Status.CANCELLED, drops.drop(sheet(), () -> true));
+        assertEquals(1, fixture.creates);
+        assertEquals(0, fixture.spawnCalls);
+        assertEquals(0, fixture.spawnEvents);
+        assertFalse(fixture.inWorld);
+        // The player boundary rejects any getInventory/dropItem call: no cancelled sheet is inserted there.
+    }
+
+    @Test
+    void staleContextBeforeOrDuringThePlayerDropEventPreventsWorldInsertion() {
+        for (boolean staleInitially : new boolean[] {false, true}) {
+            var fixture = new WorldFixture();
+            var current = new java.util.concurrent.atomic.AtomicBoolean(!staleInitially);
+            var events = new AtomicInteger();
+            var drops = new PlayerSheetDrops(fixture.player, event -> { events.incrementAndGet(); current.set(false); });
+            assertEquals(Status.STALE, drops.drop(sheet(), current::get));
+            assertEquals(staleInitially ? 0 : 1, fixture.creates);
+            assertEquals(staleInitially ? 0 : 1, events.get());
+            assertEquals(0, fixture.spawnCalls);
+        }
+    }
+
+    @Test
+    void changedRemovedOrAlreadyPublishedEntitiesAreNotSpawnedAgainOrOverwritten() {
+        for (int scenario = 0; scenario < 4; scenario++) {
+            var fixture = new WorldFixture();
+            int mutation = scenario;
+            var drops = new PlayerSheetDrops(fixture.player, event -> {
+                if (mutation == 0) fixture.stack.setAmount(2);
+                if (mutation == 1) fixture.removed = true;
+                if (mutation == 2) { fixture.inWorld = true; event.setCancelled(true); }
+                if (mutation == 3) fixture.stack = sheet();
+            });
+            assertEquals(Status.UNCONFIRMED, drops.drop(sheet(), () -> true));
+            assertEquals(0, fixture.spawnCalls);
+            if (mutation == 0) assertEquals(2, fixture.stack.getAmount());
+            if (mutation == 2) assertTrue(fixture.inWorld);
+        }
+    }
+
+    @Test
+    void cancelledNativeSpawnsAndPostInsertionChangesAreUnconfirmedRatherThanSuccessfulDrops() {
+        for (int scenario = 0; scenario < 3; scenario++) {
+            var fixture = new WorldFixture();
+            if (scenario == 0) fixture.onSpawn = event -> event.setCancelled(true);
+            if (scenario == 1) fixture.onAdded = () -> fixture.removed = true;
+            if (scenario == 2) fixture.onAdded = () -> fixture.stack = new ItemStack(org.bukkit.Material.DIAMOND);
+            var drops = new PlayerSheetDrops(fixture.player, event -> { });
+            assertEquals(Status.UNCONFIRMED, drops.drop(sheet(), () -> true));
+            assertEquals(1, fixture.spawnCalls);
+            assertEquals(1, fixture.spawnEvents);
+            if (scenario == 0) assertFalse(fixture.inWorld);
+            if (scenario == 2) assertEquals(org.bukkit.Material.DIAMOND, fixture.stack.getType());
+        }
+    }
+
+    @Test
+    void rejectsNonSheetsAndWrongStackCountsBeforeAnyPublicCallback() {
+        var multiple = sheet();
+        multiple.setAmount(2);
+        for (var invalid : List.of(new ItemStack(org.bukkit.Material.PAPER), multiple)) {
+            var fixture = new WorldFixture();
+            var drops = new PlayerSheetDrops(fixture.player, event -> fail("Invalid sheet reached an event"));
+            assertThrows(IllegalArgumentException.class, () -> drops.drop(invalid, () -> true));
+            assertEquals(0, fixture.creates);
+        }
+    }
+
+    @Test
+    void realDispatcherCancellationFlowsThroughSavedDropExecutionWithoutChargingCancelledUnits() throws Exception {
+        var server = proxy(org.bukkit.Server.class, (name, args) -> switch (name) {
+            case "isPrimaryThread" -> true;
+            default -> throw new AssertionError("Unexpected server call " + name);
+        });
+        var dispatcher = new io.papermc.paper.plugin.manager.NativeEventDispatcher(server);
+        var plugin = proxy(org.bukkit.plugin.Plugin.class, (name, args) -> switch (name) {
+            case "isEnabled" -> true;
+            default -> throw new AssertionError("Unexpected plugin call " + name);
+        });
+        for (int mode = 0; mode < 3; mode++) {
+            var listener = new org.bukkit.event.Listener() { };
+            var trace = new java.util.ArrayList<String>();
+            int cancellation = mode;
+            PlayerDropItemEvent.getHandlerList().register(new org.bukkit.plugin.RegisteredListener(listener, (ignored, raw) -> {
+                trace.add("player-veto");
+                if (cancellation == 1) ((PlayerDropItemEvent) raw).setCancelled(true);
+            }, org.bukkit.event.EventPriority.HIGH, plugin, false));
+            PlayerDropItemEvent.getHandlerList().register(new org.bukkit.plugin.RegisteredListener(listener,
+                (ignored, raw) -> trace.add("player-allowed"), org.bukkit.event.EventPriority.HIGHEST, plugin, true));
+            ItemSpawnEvent.getHandlerList().register(new org.bukkit.plugin.RegisteredListener(listener, (ignored, raw) -> {
+                trace.add("spawn-veto");
+                if (cancellation == 2) ((ItemSpawnEvent) raw).setCancelled(true);
+            }, org.bukkit.event.EventPriority.HIGH, plugin, false));
+            ItemSpawnEvent.getHandlerList().register(new org.bukkit.plugin.RegisteredListener(listener,
+                (ignored, raw) -> trace.add("spawn-allowed"), org.bukkit.event.EventPriority.HIGHEST, plugin, true));
+            try {
+                var fixture = new WorldFixture();
+                fixture.onSpawn = dispatcher::accept;
+                var grid = new ManualCraftPlanNativeTest.Fixture(2, 2);
+                var plan = games.dmg.fantasystick.crafting.ManualCraftPlan.capture(grid.event(
+                    org.bukkit.event.inventory.ClickType.DROP, org.bukkit.event.inventory.InventoryAction.DROP_ONE_SLOT)).orElseThrow();
+                var record = new CharacterFactory().create(ProgressionRules.defaults());
+                try (var storage = new games.dmg.fantasystick.persistence.CharacterStorage(
+                        new games.dmg.fantasystick.persistence.YamlCharacterRepository(data), java.time.Clock.systemUTC())) {
+                    var attempt = storage.prepareCraft(List.of(record));
+                    var result = games.dmg.fantasystick.crafting.ManualDropDelivery.commit(plan, attempt.ready().join(),
+                        () -> grid.view, () -> true, new PlayerSheetDrops(fixture.player, dispatcher::accept));
+                    assertEquals(mode == 0 ? Status.COMPLETE : mode == 1 ? Status.CANCELLED : Status.UNCONFIRMED, result.status());
+                    assertEquals(mode == 0 ? 1 : 0, result.completed());
+                    assertEquals(mode == 0 ? 1 : 2, grid.grid.getMatrix()[0].getAmount());
+                    assertTrue(grid.view.getCursor().isEmpty());
+                    assertNull(grid.inventory.getItem(8));
+                    assertEquals(mode == 1 ? List.of("player-veto") : mode == 2 ? List.of("player-veto", "player-allowed", "spawn-veto")
+                        : List.of("player-veto", "player-allowed", "spawn-veto", "spawn-allowed"), trace);
+                    assertEquals(1, attempt.abandon().join().retained().size());
+                }
+            } finally {
+                org.bukkit.event.HandlerList.unregisterAll(listener);
+            }
+        }
+    }
+
+    private static ItemStack sheet() {
+        return new CharacterSheets().create(new CharacterFactory().create(ProgressionRules.defaults()));
+    }
+
+    static final class WorldFixture {
+        final UUID playerId = UUID.randomUUID();
+        final World world;
+        final Player player;
+        final Item item;
+        ItemStack stack;
+        Location location;
+        Vector velocity;
+        UUID thrower;
+        int pickupDelay;
+        int creates;
+        int spawnCalls;
+        int spawnEvents;
+        boolean inWorld;
+        boolean removed;
+        Consumer<ItemSpawnEvent> onSpawn = event -> { };
+        Runnable onAdded = () -> { };
+
+        WorldFixture() {
+            item = proxy(Item.class, (name, args) -> switch (name) {
+                case "setItemStack" -> { stack = ((ItemStack) args[0]).clone(); yield null; }
+                case "getItemStack" -> stack.clone();
+                case "setPickupDelay" -> { pickupDelay = (int) args[0]; yield null; }
+                case "setThrower" -> { thrower = (UUID) args[0]; yield null; }
+                case "setVelocity" -> { velocity = ((Vector) args[0]).clone(); yield null; }
+                case "getLocation" -> location.clone();
+                case "isInWorld", "isValid" -> inWorld && !removed;
+                case "isDead" -> removed;
+                case "spawnAt" -> {
+                    spawnCalls++;
+                    assertEquals(org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.CUSTOM, args[1]);
+                    var event = new ItemSpawnEvent(argsItem());
+                    spawnEvents++;
+                    onSpawn.accept(event);
+                    if (event.isCancelled() || removed) { removed = true; yield false; }
+                    inWorld = true;
+                    onAdded.run();
+                    yield true;
+                }
+                default -> throw new AssertionError("Unexpected item call " + name);
+            });
+            world = proxy(World.class, (name, args) -> switch (name) {
+                case "createEntity" -> {
+                    creates++;
+                    assertEquals(Item.class, args[1]);
+                    location = ((Location) args[0]).clone();
+                    returnItemUnspawned();
+                    yield item;
+                }
+                default -> throw new AssertionError("Unexpected world call " + name);
+            });
+            player = proxy(Player.class, (name, args) -> switch (name) {
+                case "getUniqueId" -> playerId;
+                case "getEyeLocation" -> new Location(world, 10, 65.62, 10, 0, 0);
+                default -> throw new AssertionError("Unexpected player call " + name);
+            });
+        }
+
+        private Item argsItem() { return item; }
+        private void returnItemUnspawned() { inWorld = false; removed = false; }
+    }
+
+    @FunctionalInterface
+    private interface Call { Object invoke(String name, Object[] args); }
+
+    private static <T> T proxy(Class<T> type, Call call) {
+        return type.cast(Proxy.newProxyInstance(type.getClassLoader(), new Class<?>[] {type}, (object, method, args) -> {
+            if (method.getDeclaringClass() == Object.class) return switch (method.getName()) {
+                case "equals" -> object == args[0];
+                case "hashCode" -> System.identityHashCode(object);
+                case "toString" -> "Boundary fixture " + type.getSimpleName();
+                default -> throw new AssertionError(method.getName());
+            };
+            return call.invoke(method.getName(), args);
+        }));
+    }
+}

src/nativeTest/java/io/papermc/paper/plugin/manager/NativeEventDispatcher.java

@@ -0,0 +1,14 @@
+package io.papermc.paper.plugin.manager;
+
+import java.util.function.Consumer;
+import org.bukkit.Server;
+import org.bukkit.event.Event;
+
+/** Test-only access to the pinned package-private dispatcher; never included in the plugin artifact. */
+public final class NativeEventDispatcher implements Consumer<Event> {
+    private final PaperEventManager manager;
+
+    public NativeEventDispatcher(Server server) { manager = new PaperEventManager(server); }
+
+    @Override public void accept(Event event) { manager.callEvent(event); }
+}

src/test/java/games/dmg/fantasystick/crafting/CharacterFactoryTest.java

@@ -0,0 +1,64 @@
+package games.dmg.fantasystick.crafting;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.progression.ProgressionRules;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.util.List;
+import java.util.Map;
+import java.util.Random;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.atomic.AtomicInteger;
+import org.junit.jupiter.api.Test;
+
+class CharacterFactoryTest {
+    @Test
+    void randomNamesVaryButNamesMayCollideWithoutSharingIdentity() {
+        var first = new CharacterFactory(UUID::randomUUID, new Random(7));
+        var replay = new CharacterFactory(UUID::randomUUID, new Random(7));
+        var names = new java.util.HashSet<String>();
+        var ids = new java.util.HashSet<UUID>();
+        for (int index = 0; index < 64; index++) {
+            var character = first.create(ProgressionRules.defaults());
+            assertEquals(character.name(), replay.create(ProgressionRules.defaults()).name());
+            assertTrue(ids.add(character.id()));
+            assertEquals(BigInteger.valueOf(40), character.unspentPoints());
+            names.add(character.name());
+        }
+        assertTrue(names.size() > 1, "Names must use the supplied randomness, not a constant placeholder");
+        var collisions = new CharacterFactory(UUID::randomUUID, () -> 0L);
+        var sameNameA = collisions.create(ProgressionRules.defaults());
+        var sameNameB = collisions.create(ProgressionRules.defaults());
+        assertEquals(sameNameA.name(), sameNameB.name(), "Name collisions do not require a retry or owner lock");
+        assertNotEquals(sameNameA.id(), sameNameB.id());
+    }
+
+    @Test
+    void allocatesOnlyWhenRequestedAndUsesTheApprovedFreshStateAndConfiguredPoints() {
+        var allocations = new AtomicInteger();
+        var id = UUID.randomUUID();
+        var factory = new CharacterFactory(() -> { allocations.incrementAndGet(); return id; }, new Random(17));
+        assertEquals(0, allocations.get(), "Constructing a factory must not create a character");
+        var rules = new ProgressionRules(BigInteger.TEN.pow(40), BigInteger.valueOf(100), 30);
+        var record = factory.create(rules);
+        assertNotNull(record, "An accepted allocation must produce a fresh named character");
+        assertEquals(1, allocations.get());
+        assertEquals(id, record.id());
+        assertFalse(record.name().isBlank());
+        assertEquals(BigInteger.ZERO, record.revision());
+        assertEquals(6, record.stats().size());
+        assertTrue(record.stats().values().stream().allMatch(BigInteger.ZERO::equals));
+        assertEquals(1, record.level());
+        assertEquals(BigInteger.ZERO, record.experience());
+        assertEquals(rules.startingPoints(), record.unspentPoints());
+        assertEquals(BigDecimal.TEN, record.health());
+        assertEquals(Set.of(), record.learned());
+        assertEquals(List.of("", "", "", "", "", "", ""), record.loadout());
+        assertEquals(Map.of(), record.cooldowns());
+        assertFalse(record.dead());
+        assertNull(record.deathId());
+        assertNull(record.diedAt());
+    }
+}

src/test/java/games/dmg/fantasystick/persistence/CraftPersistenceTest.java

@@ -267,17 +267,18 @@ class CraftPersistenceTest {
                 CharacterStorage.CraftCleanup cleanup;
                 if (scenario == 3) {
                     try (var channel = java.nio.channels.FileChannel.open(
-                            data.resolve("characters").resolve(protectedRecord.id() + ".lock"),
+                            data.resolve("characters").resolve(".records.lock"),
                             java.nio.file.StandardOpenOption.WRITE);
                          var lock = channel.lock()) {
                         assertTrue(lock.isValid());
                         cleanup = batch.abandon().join();
                     }
                 } else cleanup = batch.abandon().join();
-                assertEquals(Set.of(protectedRecord.id()), cleanup.retained());
-                assertEquals(Set.of(removable.id()), cleanup.removed());
+                assertEquals(scenario == 3 ? Set.of(protectedRecord.id(), removable.id())
+                    : Set.of(protectedRecord.id()), cleanup.retained());
+                assertEquals(scenario == 3 ? Set.of() : Set.of(removable.id()), cleanup.removed());
                 assertTrue(java.nio.file.Files.exists(file, java.nio.file.LinkOption.NOFOLLOW_LINKS));
-                assertTrue(storage.find(removable.id()).join().isEmpty());
+                assertEquals(scenario != 3, storage.find(removable.id()).join().isEmpty());
                 if (scenario == 2) {
                     assertTrue(java.nio.file.Files.isSymbolicLink(file));
                     assertTrue(java.nio.file.Files.isRegularFile(data.resolve("protected-target.yml")));

src/test/java/games/dmg/fantasystick/persistence/YamlCharacterRepositoryTest.java

@@ -43,6 +43,67 @@ class YamlCharacterRepositoryTest {
             original.loadout(), original.cooldowns(), original.dead(), original.deathId(), original.diedAt());
     }
 
+    @Test
+    void repeatedCreationAndAbandonmentDoNotAccumulatePerCharacterCoordinationFiles() throws Exception {
+        var repository = new YamlCharacterRepository(data);
+        for (int index = 0; index < 96; index++) {
+            var created = repository.createTracked(sample(UUID.randomUUID()));
+            assertTrue(repository.discardUnissued(created));
+        }
+        try (var paths = Files.list(data.resolve("characters"))) {
+            var remaining = paths.toList();
+            assertTrue(remaining.size() <= 1, "Abandoned crafts must not leave one coordination file per generated ID");
+            assertTrue(remaining.stream().allMatch(path -> path.getFileName().toString().endsWith(".lock")));
+        }
+        var legitimate = sample(UUID.randomUUID());
+        repository.create(legitimate);
+        assertEquals(legitimate, repository.load(legitimate.id()).orElseThrow());
+    }
+
+    @Test
+    void sharedCoordinationRefusesEveryMutationWhileBusyAndPermitsRetryAfterRelease() throws Exception {
+        var repository = new YamlCharacterRepository(data);
+        var original = sample(UUID.randomUUID());
+        var unissued = repository.createTracked(sample(UUID.randomUUID()));
+        var candidate = sample(UUID.randomUUID());
+        repository.create(original);
+        var update = rename(original, "Retry after contention", BigInteger.ONE);
+        try (var channel = java.nio.channels.FileChannel.open(data.resolve("characters/.records.lock"),
+                java.nio.file.StandardOpenOption.WRITE);
+             var lock = channel.lock()) {
+            assertTrue(lock.isValid());
+            assertThrows(IOException.class, () -> new YamlCharacterRepository(data).create(candidate));
+            assertThrows(IOException.class, () -> repository.replace(update, BigInteger.ZERO));
+            assertThrows(IOException.class, () -> repository.discardUnissued(unissued));
+            assertEquals(original, repository.load(original.id()).orElseThrow());
+            assertEquals(unissued.record, repository.load(unissued.record.id()).orElseThrow());
+            assertTrue(repository.load(candidate.id()).isEmpty());
+        }
+        repository.create(candidate);
+        repository.replace(update, BigInteger.ZERO);
+        assertTrue(repository.discardUnissued(unissued));
+        assertEquals(update, repository.load(original.id()).orElseThrow());
+    }
+
+    @Test
+    void leavesLegacyCoordinationFilesIntactAndRefusesASymlinkedSharedLock() throws Exception {
+        var repository = new YamlCharacterRepository(data);
+        var original = sample(UUID.randomUUID());
+        repository.create(original);
+        var legacy = data.resolve("characters").resolve(original.id() + ".lock");
+        Files.writeString(legacy, "Legacy coordination fixture");
+        repository.replace(rename(original, "Updated", BigInteger.ONE), BigInteger.ZERO);
+        assertEquals("Legacy coordination fixture", Files.readString(legacy));
+        var shared = data.resolve("characters/.records.lock");
+        Files.delete(shared); // Test setup only: no writer is holding this fixture lock.
+        var outside = data.resolve("outside-lock");
+        Files.writeString(outside, "Protected outside fixture");
+        Files.createSymbolicLink(shared, outside);
+        assertThrows(IOException.class, () -> repository.create(sample(UUID.randomUUID())));
+        assertEquals("Protected outside fixture", Files.readString(outside));
+        assertTrue(Files.isSymbolicLink(shared));
+    }
+
     @Test
     void updatesExactlyTheExpectedRevisionAndNeverOverwritesWithAStaleCopy() throws Exception {
         var repository = new YamlCharacterRepository(data);