Add logging for silent git exceptions

[davidpoblador]

Summary

Git-related exceptions are silently swallowed with pass, making it difficult to debug why git operations might not be working.

File to update

• src/blogtuner/utils/git.py

Current code (lines 30-31)

except (git.InvalidGitRepositoryError, git.NoSuchPathError, ValueError):
    pass  # Not a git repo or file not tracked

Proposed change

except (git.InvalidGitRepositoryError, git.NoSuchPathError, ValueError) as e:
    logger.debug(f"Not using git mv (reason: {e}), falling back to regular rename")

Rationale

• Debug-level logging provides visibility without cluttering normal output
• Helps diagnose unexpected behavior when git operations silently fall back
• Maintains current functionality while improving observability

Priority

Low