- Add clearDomCache() for jQuery object cache invalidation on panel rebuild
- Track all event handlers in on()/once() for complete cleanup by unregisterAllEvents()
- Migrate direct eventSource.on() calls to tracked onEvent() in index.js, injector.js, sillyTavernExpressions.js
- Add clearDebugLogs() called on CHAT_CHANGED to prevent memory accumulation
- Add trackJQueryHandler()/cleanupJQueryEvents() infrastructure for jQuery event cleanup
- Add comprehensive memory management tests (14 new tests, all passing)
