FileWatcher.dispose():
- Calls stop() to close watchers
- Clears all timers: retry, debounce, catch-up, polling
- Clears all tracking maps: lastProcessedLineCount, lastProcessedSize, activeSessionFiles, polledFileSizes, processingInProgress, pendingReprocess
- Calls removeAllListeners() LAST to prevent events during cleanup
- Sets disposed flag to prevent reuse
DataCache.dispose():
- Clears cache Map
- Disables caching
- Sets disposed flag to prevent reuse
- Auto-cleanup interval managed by caller (ServiceContext)
Both services prevent restart after disposal for proper lifecycle management.
