Improve root directory validation with enhanced error handlingfix-root-directory-validation

Enhanced root directory validation with several improvements:

1. **Better Error Messages**: More descriptive error messages with specific
   guidance on how to resolve issues (create directory, check permissions, etc.)

2. **Path Canonicalization**: Resolve symlinks and relative paths to absolute
   canonical paths, ensuring consistent behavior across different path formats

3. **Write Permission Validation**: Proactively check write permissions by
   creating a temporary test file before attempting daemon operations

4. **Comprehensive Edge Case Handling**:
   - Broken symlinks are properly detected as non-existent
   - Regular symlinks to directories are resolved correctly
   - Symlinks to files are rejected appropriately
   - Deep nested non-existent paths are handled gracefully

5. **Enhanced Git Root Handling**: Better error messages for git repository
   detection failures and .demon directory creation issues

6. **Robust Testing**: Added comprehensive test suite covering:
   - All edge cases and error conditions
   - Improved error message validation
   - Write permission validation
   - Path canonicalization behavior
   - Symlink handling (valid, broken, to files, to directories)

The validation now provides clear, actionable feedback to users when
directory issues are encountered, making the tool more user-friendly
and robust in various deployment scenarios.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

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