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

src/lib/game/stores/combatStore.ts

@@ -223,6 +223,7 @@ export const useCombatStore = create<CombatState>()(
         attackSpeedMult: number,
         onFloorCleared: (floor: number, wasGuardian: boolean) => void,
         onDamageDealt: (damage: number) => { rawMana: number; elements: Record<string, { current: number; max: number; unlocked: boolean }> },
+        signedPacts: number[],
       ) => {
         return processCombatTick(
           get,
@@ -233,6 +234,7 @@ export const useCombatStore = create<CombatState>()(
           attackSpeedMult,
           onFloorCleared,
           onDamageDealt,
+          signedPacts,
         );
       },