Addresses multiple code review findings related to authentication, change detection, error handling, and documentation accuracy.

Authentication & Long-running Processes

• JWT now refreshed on each upload in track and watch commands instead of cached at startup
• Prevents auth failures in long-running processes when tokens expire

Change Detection

• Restore change detection for manual checkpoints to show actual file diffs
• Fix isNew file detection to use remote state instead of string-matching action reasons

Error Handling

• Add file read error handling in batch upload to gracefully skip unreadable files
• Track individual file success/failure in batch uploads for accurate manifest updates
• Normalize workspace URLs to ensure trailing slash before batch operations

Platform Compatibility

• Conditional recursive watch on Linux (recursive: process.platform !== 'linux')
• Avoids ERR_FEATURE_UNAVAILABLE_ON_PLATFORM errors while maintaining polling fallback

Security & Documentation

• Restore password security warning for -p flag
• Update share command docs to reflect actual skipped files (.realm.json only)
• Remove .claude/settings.local.json from version control and add to .gitignore

Code Cleanup

• Remove unused username variable in profile.ts
• Remove unused color constants (CYAN, YELLOW) in sync.ts

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