fix: prevent non-combat room repeated rewards during descent (Issue #382)

- Wrap library XP grant in progress < required guard so completed rooms don't grant XP every tick
- Add early return in treasure room tick when progress >= required to skip loot processing
- Initialize non-combat rooms (library, treasure, recovery) during descent in onEnterRoomDescend
- Add regression test file: non-combat-room-reward-guards.test.ts (8 tests)

docs/circular-deps.txt

@@ -1,5 +1,5 @@
 # Circular Dependencies
-Generated: 2026-06-12T10:30:18.304Z
+Generated: 2026-06-12T10:39:16.751Z
 Found: 4 circular chain(s) — these MUST be fixed before modifying involved files.
 
 1. 1) data/guardian-encounters.ts > data/guardian-procedural.ts