feat(rg): honor global git ignore files

[chaliy]

What

Adds rg support for global git ignore discovery during recursive searches.

Why

Real rg applies global git ignore rules from core.excludesFile or the default git ignore file for recursive roots in git repositories, and --no-ignore-global disables that behavior. Bashkit accepted those flags but did not model the behavior.

How

• Loads core.excludesFile from $HOME/.gitconfig, falling back to $XDG_CONFIG_HOME/git/ignore or $HOME/.config/git/ignore when no configured excludes file exists.
• Applies global ignore rules per recursive root only when the root is in a git repo, unless --no-require-git is set.
• Keeps explicit file searches unaffected, matching real rg ignore behavior.
• Adds env-aware data-driven differential cases against real rg plus unit coverage.

Risk

• Low / Medium
• Recursive rg output changes when the virtual environment contains HOME/XDG global git ignore files; explicit file paths still bypass ignore filtering.

Checklist

• Tests added or updated
• Backward compatibility considered

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	bashkit	1fbcb8d	Commit Preview URL	May 22 2026, 06:23 PM