feat: implement Transference Channel system for Enchanter attunement

- Add isChanneling, channelSpeedMultiplier, channelDrainRate to CombatState
- Add startChanneling/stopChanneling actions to combat store
- Add transference-channeling discipline with 3 perks (channel-efficiency, channel-power, channel-mastery)
- Add channelIntensity and channelEfficiency to KNOWN_BONUS_STATS
- Create combat-channel.ts with drain + speed multiplier computation
- Apply channel speed multiplier to equipment spells and melee attacks
- Add Channel Transference hold-button UI to SpireCombatPage
- Add compact channel status indicator to SpireCombatControls
- Channel state resets on spire exit, persists across room transitions
- All 1235 existing tests pass

docs/dependency-graph.json

@@ -1,6 +1,6 @@
 {
   "_meta": {
-    "generated": "2026-06-13T15:26:13.488Z",
+    "generated": "2026-06-13T17:47:22.745Z",
     "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."
   },
@@ -760,7 +760,6 @@
       "utils/element-cap-bonus.ts",
       "utils/element-distance.ts",
       "utils/index.ts",
-      "utils/invocation-utils.ts",
       "utils/safe-persist.ts"
     ],
     "stores/gameStore.types.ts": [],