docs(sort): define sorting stick recipe

design/log.md

@@ -13,3 +13,8 @@ description: Chronological record of material decisions affecting the Spigot Inv
 - Player-inventory sorting will leave the hotbar, armor, and off-hand slots unchanged.
 - When a main-hand tool breaks, an equivalent tool with the same material and tool type will be moved from the player's inventory into the selected hotbar slot when available.
 - The knowledge bundle and eventual Gradle, Purpur, Gitea CI, and semantic-release setup will follow the neighboring Spigot Base project where applicable.
+
+## 2026-09-04 — Sorting Stick recipe
+
+- The Sorting Stick uses a vertical recipe in the crafting grid's center column: a Chest or Barrel above Redstone Dust, with a Stick at the bottom.
+- Either storage-block variant produces one Sorting Stick.

design/user-stories/us-002-craft-sorting-stick.md

@@ -11,12 +11,14 @@ As a **player**, I want to craft a recognizable Sorting Stick so that I can invo
 
 ## Acceptance criteria
 
-- [ ] The plugin registers a documented shaped crafting recipe for the Sorting Stick.
+- [ ] The plugin registers a vertical shaped recipe with a Chest or Barrel above Redstone Dust and Redstone Dust above a Stick.
+- [ ] The three ingredients occupy the center column of the 3×3 crafting grid.
+- [ ] Either the Chest or Barrel recipe variant produces one Sorting Stick.
 - [ ] The Sorting Stick has a distinct player-facing name and appearance.
 - [ ] The item is identified using persistent item metadata rather than its display name alone.
 - [ ] Renamed ordinary sticks cannot trigger sorting.
-- [ ] Recipe registration, recipe shape, and resulting item identity are covered by automated tests.
-- [ ] The crafting recipe is documented for players.
+- [ ] Automated tests cover recipe registration, the exact shape, both storage-block variants, output quantity, and resulting item identity.
+- [ ] The crafting recipe and both accepted variants are documented for players.
 
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