fix: make cooldown_action decorator properly await async finish() (#75)

* fix: make cooldown_action decorator properly await async finish()

The decorator was incorrectly wrapping the async finish() method with a sync
wrapper, causing cooldown to be recorded BEFORE the action actually executed.

This fix:
- Changes wrapper to async def finish()
- Awaits original_finish() before recording cooldown
- Ensures cooldown is only recorded on successful execution

Fixes #74

* test: add test to verify cooldown not recorded on failure

This test actually reveals the async/await bug:
- Creates a FailingAction that raises in finish()
- Verifies cooldown is NOT recorded when action fails
- Fails with buggy sync wrapper, passes with async fix

src/classes/action/cooldown.py

@@ -34,8 +34,10 @@ def cooldown_action(cls: type) -> type:
     if hasattr(cls, "finish"):
         original_finish = cls.finish
 
-        def finish(self, **params):  # type: ignore[no-redef]
-            events = original_finish(self, **params)
+        async def finish(self, **params):  # type: ignore[no-redef]
+            # Must await original_finish first, then record cooldown.
+            # This ensures cooldown is only recorded after finish() succeeds.
+            events = await original_finish(self, **params)
             last_map = getattr(self.avatar, "_action_cd_last_months", None)
             if last_map is not None:
                 last_map[self.__class__.__name__] = self.world.month_stamp