fix: resolve 3 critical bugs — #354 attunement ReferenceError, #353 preparation mana exploit, #352 golem mana wipe

- #354: unlockAttunement now uses _get() instead of undefined 'state' variable
- #353: startPreparing now deducts raw mana from the mana store after validation
- #352: processGolemAttacks/processBasicAttack accept current mana as params instead of initializing to 0/{}
- Updated golem-combat-actions.test.ts to pass new currentRawMana/currentElements params
- Added regression tests for all 3 bugs (16 new tests, all passing)

docs/project-structure.txt

@@ -198,6 +198,9 @@ Mana-Loop/
 │   │   │   │   ├── achievements.test.ts
 │   │   │   │   ├── activity-log.test.ts
 │   │   │   │   ├── attunement-conversion-fix.test.ts
+│   │   │   │   ├── bug-352-golem-mana-wipe.test.ts
+│   │   │   │   ├── bug-353-preparation-mana.test.ts
+│   │   │   │   ├── bug-354-unlock-attunement.test.ts
 │   │   │   │   ├── bug-fixes.test.ts
 │   │   │   │   ├── combat-actions.test.ts
 │   │   │   │   ├── combat-utils.test.ts