refactor: replace static guardians with elemental progression system

Replace the old GUARDIANS constant (arbitrary floor assignments) with a proper
elemental → compound → exotic → combo progression:

- Floors 10-70:  Base elements (Fire, Water, Air, Earth, Light, Dark, Death)
- Floor 80:       Utility element (Transference)
- Floors 90-110:  Compound elements (Metal, Sand, Lightning)
- Floors 120-140: Exotic elements (Crystal, Stellar, Void)
- Floor 150+:     Procedural combo guardians (scaling with floor)

Key changes:
- Create guardian-data.ts with BASE_GUARDIANS (14 static entries)
- Simplify guardian-encounters.ts to only handle procedural combos (150+)
- getGuardianForFloor() now generates names for empty-name entries
- Remove old compound/exotic duplicate definitions from guardian-encounters.ts
- Update spire-utils.test.ts to test the new progression
- Update SpireSummaryTab.test.ts floor counts (14 static + 10 combo = 24)

All 89 guardian-related tests pass. 3 pre-existing failures in
room-utils-floor-state.test.ts are unrelated (speed room / floor 0 edge cases).

docs/circular-deps.txt

@@ -1,8 +1,8 @@
 # Circular Dependencies
-Generated: 2026-05-23T12:53:16.980Z
+Generated: 2026-05-23T14:09:24.244Z
 Found: 4 circular chain(s) — these MUST be fixed before modifying involved files.
 
-1. Processed 129 files (1.4s) (3 warnings)
+1. Processed 129 files (1.5s) (3 warnings)
 2. 1) stores/gameStore.ts > stores/gameActions.ts
 3. 2) stores/gameStore.ts > stores/gameLoopActions.ts
 4. 3) stores/gameStore.ts > stores/tick-pipeline.ts