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

docs/dependency-graph.json

@@ -1,6 +1,6 @@
 {
   "_meta": {
-    "generated": "2026-06-10T08:50:54.740Z",
+    "generated": "2026-06-10T09:19:24.358Z",
     "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."
   },
@@ -529,6 +529,7 @@
       "effects/discipline-effects.ts",
       "effects/special-effects.ts",
       "effects/upgrade-effects.ts",
+      "stores/attunementStore.ts",
       "stores/combatStore.ts",
       "stores/gameStore.ts",
       "stores/manaStore.ts",