fix: deactivate all disciplines when entering/exiting the Spire

- Add deactivateAll() action to discipline-slice.ts
- Call deactivateAll() in createEnterSpireMode() (combat-descent-actions.ts)
- Add spireMode guard in gameStore.ts tick() to skip discipline processTick
- Call deactivateAll() in exitSpireMode() (combatStore.ts) as safety measure
- Extract buildConversionParams to utils/conversion-params.ts to keep gameStore.ts under 400 lines
- Add regression tests (5 tests, all 1136 passing)

Fixes #347

src/lib/game/stores/combat-descent-actions.ts

@@ -10,6 +10,7 @@ import { useManaStore } from './manaStore';
 import { summonGolemsOnRoomEntry } from './golem-combat-actions';
 import { computeDisciplineEffects } from '../effects/discipline-effects';
 import { useAttunementStore } from './attunementStore';
+import { useDisciplineStore } from './discipline-slice';
 import {
   onEnterLibraryRoom,
   onEnterRecoveryRoom,
@@ -278,6 +279,9 @@ export function createEnterSpireMode(get: GetFn, set: SetFn) {
       golemancy: { activeGolems: [], lastSummonFloor: 0, golemDesigns: get().golemancy?.golemDesigns ?? {}, golemLoadout: [] },
     });
 
+    // Deactivate all active disciplines when entering the Spire
+    useDisciplineStore.getState().deactivateAll();
+
     get().addActivityLog('floor_transition',
       `Entered the Spire at Floor ${startFloor}`);
   };