Summary

Improves the configuration watcher implementation and internal handling.

Changes

• Replaced O(n) directory lookup with O(1) WatchKey → Path mapping
• Added proper WatchKey cleanup to prevent memory leaks
• Improved thread-safety (volatile usage for cached state)
• Reduced redundant operations in watcher loop
• Minor code cleanup and consistency improvements

Notes

• No API changes
• No behavior changes
• Internal refactor only