feat(rg): honor parent ignore files

[chaliy]

What

Makes rg seed recursive searches with ignore rules from parent directories.

Why

Real rg honors parent .ignore, .rgignore, and applicable .gitignore files when searching a child root, unless --no-ignore-parent is set. Bashkit only loaded ignore files inside the searched root.

How

• Adds parent ignore rule loading before recursive walk roots are queued.
• Reuses existing local ignore parsing and git-repository checks.
• Preserves --no-ignore and --no-ignore-parent behavior.
• Adds unit and differential coverage against real rg for parent ignore and --no-ignore-parent.

Risk

• Low / Medium
• Recursive search filtering changes for child roots with parent ignore files; explicit file searches still bypass ignore filtering as before.

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	bb0acd5	Commit Preview URL	May 22 2026, 05:57 PM