test: add store action and cross-store tick integration tests; fix pact ritual double-counting bug

- Add test-setup.ts: shared test environment setup helper for tick integration tests
- Add combat-store.test.ts (24 tests): setCurrentFloor, advanceFloor, setFloorHP, setMaxFloorReached, setAction, setSpell, setCastProgress, learnSpell, setSpellState, debugSetFloor, resetFloorHP, resetCombat, climbDownFloor, exitSpireMode
- Add mana-store.test.ts (36 tests): setRawMana, addRawMana, spendRawMana, gatherMana, convertMana, unlockElement, addElementMana, spendElementMana, craftComposite, processConvertAction, resetMana, meditation ticks, setElementMax
- Add tick-integration.test.ts (19 tests): time progression, mana regeneration, incursion penalty, meditation, loop end, paused/game over states
- Add tick-integration-pact.test.ts (9 tests): victory condition, pact ritual progress, multiple ticks accumulation
- Add tick-debug.test.ts (3 debug tests): regen trace, pact ritual trace, persist leak check
- Fix bug in gameStore.ts: updatePactRitualProgress was called with absolute newProgress instead of incremental HOURS_PER_TICK, causing exponential progress accumulation
- All 422 tests pass (18 test files), all files under 400-line limit

docs/project-structure.txt

@@ -190,15 +190,23 @@ Mana-Loop/
 │       │   │   ├── store-method-tests/
 │       │   │   ├── achievements.test.ts
 │       │   │   ├── bug-fixes.test.ts
+│       │   │   ├── combat-store.test.ts
 │       │   │   ├── combat-utils.test.ts
 │       │   │   ├── computed-stats.test.ts
 │       │   │   ├── discipline-math.test.ts
+│       │   │   ├── discipline-store.test.ts
 │       │   │   ├── enemy-generator.test.ts
 │       │   │   ├── floor-utils.test.ts
 │       │   │   ├── formatting.test.ts
+│       │   │   ├── mana-store.test.ts
 │       │   │   ├── mana-utils.test.ts
+│       │   │   ├── prestige-store.test.ts
 │       │   │   ├── regression-fixes.test.ts
-│       │   │   └── spire-utils.test.ts
+│       │   │   ├── spire-utils.test.ts
+│       │   │   ├── test-setup.ts
+│       │   │   ├── tick-debug.test.ts
+│       │   │   ├── tick-integration-pact.test.ts
+│       │   │   └── tick-integration.test.ts
 │       │   ├── constants/
 │       │   │   ├── spells-modules/
 │       │   │   │   ├── advanced-spells.ts