feat: per-file git status display

[relmer]

Summary

Show inline git status indicators (modified, staged, untracked, ignored, etc.) next to each file in directory listings, similar to eza and lsd.

Details

Display

• Add a git status column showing indicators like M (modified), A (staged/added), ? (untracked), ! (ignored), etc.
• Color-code indicators (e.g., green for staged, red for modified, grey for ignored)
• Column should appear when inside a git repository and a /Git switch is active (or auto-detected)

Implementation Options

• libgit2 (via git2 crate for RCDir, or C bindings for TCDir): Full programmatic access, no subprocess overhead
• Shell out to git status: Simpler but slower for large repos; git status --porcelain=v2 gives machine-readable output
• Hybrid: Use git rev-parse --show-toplevel to detect repos, then git status for status

Considerations

• Performance: git status can be slow on large repos — may need caching or lazy evaluation
• Nested repos: handle submodules and nested git roots
• Non-git directories: gracefully degrade (no git column shown)
• This is the biggest gap vs eza/lsd

Switches

• /Git or --Git: enable git status display
• TCDIR=Git / RCDIR=Git: env var default
• /Git-: explicit disable

Prior Art

• eza: shows git status per file with staged/unstaged indicators
• lsd: shows git status with color-coded indicators
• Neither TCDir nor RCDir currently has any git integration

Notes

• Implement in TCDir first, then port to RCDir
• This is the most impactful missing feature compared to eza/lsd
• Consider starting with a minimal viable version (just modified/untracked) before full status support