fix(tests): remove broken test index files and fix computed-stats import

docs/dependency-graph.json

@@ -1,6 +1,6 @@
 {
   "_meta": {
-    "generated": "2026-05-19T09:44:27.808Z",
+    "generated": "2026-05-19T10:06:48.891Z",
     "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."
   },
@@ -479,9 +479,14 @@
     "stores/gameStore.ts": [
       "constants.ts",
       "data/attunements.ts",
+      "effects.ts",
+      "effects/discipline-effects.ts",
       "effects/special-effects.ts",
+      "effects/upgrade-effects.types.ts",
       "stores/attunementStore.ts",
       "stores/combatStore.ts",
+      "stores/craftingStore.ts",
+      "stores/discipline-slice.ts",
       "stores/gameActions.ts",
       "stores/gameLoopActions.ts",
       "stores/manaStore.ts",