chore: fix git cleanup error code

[martimlobao]

• fix false positive returned error code in git cleanup custom command

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Note

Improves the cleanup alias in linkme/.gitconfig for safer branch pruning and correct exit status.

• Quoted variables and added early return if git checkout fails to prevent false non-zero exits
• Filters merged branches safely (ignores current/target, handles empty lines) before git branch -d
• Uses git for-each-ref with explicit --format and guards merge-base failures
• Deletes only fully squashed branches via git cherry check, with robust parsing of branch names

^{Written by Cursor Bugbot for commit 40bf16b. This will update automatically on new commits. Configure here.}

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the custom cleanup git alias in linkme/.gitconfig to make branch pruning safer and to ensure it returns a correct non-error exit code, by hardening branching logic, quoting, and error handling.

File-Level Changes

Change	Details	Files
Hardened the custom git cleanup alias to avoid false non-zero exit codes and make branch pruning logic safer.	Ensures the alias exits early and cleanly if the initial git checkout step fails instead of continuing and returning a misleading error code. Adds proper shell quoting around variables and branch names to avoid word-splitting and issues with special characters. Refines the filtering of merged branches so it skips the current and target branches, ignores empty lines, and only passes validated branch names to deletion. Uses git for-each-ref with an explicit --format and guards calls to git merge-base so failures don’t propagate as incorrect cleanup errors. Restricts deletion to branches that are fully merged or squashed (via git cherry checks) with more robust parsing of branch names before deletion.	linkme/.gitconfig

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