auto-claude: subtask-2-1 - Create tests for cache.ts (TTL, get/set, expiration logic)

- Created comprehensive test suite for cache.ts covering:
  - set() and get() operations with various data types
  - TTL expiration logic (default, custom, and edge cases)
  - has() method for checking key existence
  - delete() method for removing individual keys
  - clear() method for removing all keys
  - Expiration boundary testing
  - Different TTL values for different items
  - TTL reset when items are overwritten
- Fixed vitest.config.ts to include src/utils/** tests
- Fixed tsconfig.json to include src/utils/** files
- Used vi.useFakeTimers() for deterministic time-based testing
- All tests properly isolated with beforeEach/afterEach hooks

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.gitignore

@@ -81,4 +81,7 @@ supabase/.temp/
 .history/
 
 # Source images (originals before optimization)
-source-images/
+source-images/
+
+# Auto Claude data directory
+.auto-claude/