fix(teleport): enforce visitor warm-up

design/user-stories/us-008-unlock-visitor-access.md

@@ -21,7 +21,7 @@ As a **player with Base III**, I want to open my base to visitors so that other
 - [x] `/gotobase <owner>` autocompletes bases that the requesting player is currently eligible to visit.
 - [x] `/visit <owner>` aliases `/gotobase <owner>` with identical autocomplete, including eligible bases whose owners are offline.
 - [x] Enabled bases remain visitable while their owners are offline.
-- [x] A visitor teleport uses the destination owner's current warm-up tier.
+- [x] A visitor teleport uses the destination owner's current warm-up tier, but always requires at least a one-second stationary warm-up; `/visit` and `/gotobase` never teleport instantly.
 - [x] Looking around is permitted, while movement between block coordinates, damage, teleportation, world change, death, logout, or a conflicting teleport cancels the visitor warm-up.
 - [x] Cancellation or destination failure does not consume a visitor cooldown.
 - [x] A safe destination is resolved at or near the owner's recorded base center.

src/main/java/games/dmg/spigotbase/BaseTeleportManager.java

@@ -95,7 +95,7 @@ final class BaseTeleportManager implements Listener {
         begin(
             visitor,
             owner.base().orElseThrow(),
-            policy.warmup(owner),
+            policy.visitorWarmup(owner),
             owner.playerId(),
             policy.cooldown(owner),
             "visit " + owner.latestName() + "'s base"

src/main/java/games/dmg/spigotbase/TeleportPolicy.java

@@ -25,6 +25,13 @@ public final class TeleportPolicy {
         };
     }
 
+    public Duration visitorWarmup(PlayerState owner) {
+        Duration warmup = warmup(owner);
+        return warmup.compareTo(Duration.ofSeconds(1)) < 0
+            ? Duration.ofSeconds(1)
+            : warmup;
+    }
+
     public Duration cooldown(PlayerState player) {
         return switch (player.cooldownLevel()) {
             case 0 -> Duration.ofSeconds(settings.current().initialTeleportCooldownSeconds());

src/test/java/games/dmg/spigotbase/TeleportPolicyTest.java

@@ -22,6 +22,17 @@ final class TeleportPolicyTest {
         assertEquals(Duration.ZERO, policy.warmup(player.withTeleportLevels(3, 0)));
     }
 
+    @Test
+    void visitorWarmupHasOneSecondMinimum() {
+        PlayerState player = baseThreePlayer();
+
+        assertEquals(Duration.ofSeconds(30), policy.visitorWarmup(player));
+        assertEquals(
+            Duration.ofSeconds(1),
+            policy.visitorWarmup(player.withTeleportLevels(3, 0))
+        );
+    }
+
     @Test
     void cooldownLevelsUseApprovedDurations() {
         PlayerState player = baseThreePlayer();