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/dependency-graph.json

@@ -1,6 +1,6 @@
 {
   "_meta": {
-    "generated": "2026-05-20T10:36:02.953Z",
+    "generated": "2026-05-20T11:01:18.069Z",
     "description": "Import dependency graph for src/lib/game. Keys are files, values are arrays of files they import.",
     "usage": "To find what a file affects, search for its path in the VALUES. To find what a file depends on, look at its KEY entry."
   },