refactor: tick pipeline pattern — read all → compute all → write all (issue #103)

- New tick-pipeline.ts: TickContext/TickWrites types + buildTickContext/applyTickWrites orchestrator
- gameStore.ts tick(): refactored to 3-phase pipeline (read snapshot → compute updates → batch writes)
- combat-actions.ts: accept signedPacts as parameter instead of usePrestigeStore.getState() in combat loop
- combatStore.ts/combat-state.types.ts: updated processCombatTick signature for signedPacts passthrough
- craftingStore.ts: removed tempState = { ...get(), rawMana } as any anti-pattern
- preparation-actions.ts: accept rawMana as explicit parameter instead of GameState bag

docs/dependency-graph.json

@@ -1,6 +1,6 @@
 {
   "_meta": {
-    "generated": "2026-05-20T15:46:46.373Z",
+    "generated": "2026-05-20T16:38:28.025Z",
     "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."
   },