feat(pocket-base): allow mobs through portals

design/log.md

@@ -129,3 +129,10 @@ description: Chronological record of material decisions affecting the Spigot Bas
 - Compiled and tested against the exact Purpur 26.2 build 2618 API with Java 25, and updated both CI workflows to use Java 25.
 - Preserved unit-test coverage through server-independent dialog specifications and adapted Bukkit test fixtures to Purpur's registry-aware API behavior.
 - Verified 128 tests and the Java 25 plugin artifact with `./gradlew clean check jar`.
+
+## 2026-08-24 — Pocket Base mob portal travel
+
+- Added five-tick collision scanning that transports non-player living mobs through active Pocket Base entrance and return portals.
+- Reused safe player destinations and server-spawn fallback behavior while excluding items, projectiles, vehicles, and other non-living entities.
+- Applied the existing two-second portal cooldown to mobs to prevent immediate repeated transport.
+- Verified the feature and Java 25 plugin artifact with `./gradlew clean check jar`.

design/user-stories/us-016-build-and-use-pocket-base-portals.md

@@ -19,8 +19,13 @@ As a **Pocket Base owner**, I want to connect my normal base to my Pocket Base w
 - [x] Activating another valid entrance deactivates the previous entrance without removing its frame blocks.
 - [x] Breaking any required frame block immediately deactivates the entrance.
 - [x] Any player can use an active entrance without a separate visitor setting, warm-up, or cooldown.
+- [x] Non-player living mobs entering an active entrance portal are teleported into that Pocket Base.
+- [x] Portal cooldown handling prevents transported mobs from immediately bouncing back.
+- [x] Items, projectiles, vehicles, and other non-living entities are not transported.
 - [x] Visitors can build, break blocks, open containers, and otherwise interact normally inside the Pocket Base.
 - [x] The generated return portal sends players safely to the owner's active entrance.
+- [x] Non-player living mobs entering the active, intact return portal are teleported safely outside the normal-world entrance.
+- [x] Mob return travel falls back safely to the server spawn when the owner has no valid normal-world entrance.
 - [x] Only the owner can activate a complete portal frame inside their own Pocket Base with flint and steel.
 - [x] Every required return-frame block must be within the owner's unlocked Pocket Base boundary.
 - [x] Each Pocket Base has at most one active return portal, and activating another valid frame moves the active return location without removing the old frame.