[codex] Filter origin HEAD from branch picker

[Syati]

Summary

• Filter refs/remotes/origin/HEAD before normalizing branch names in the branch picker.
• Add a regression test that ensures origin is not shown as a selectable branch.

Root cause

git for-each-ref --format='%(refname:short)' can shorten refs/remotes/origin/HEAD to origin, so the previous origin/HEAD filter did not catch it.

Validation

• zsh test/run.zsh

[Copilot]

Pull request overview

This PR fixes a branch-picker edge case where the remote symbolic ref refs/remotes/origin/HEAD could be shortened by Git to origin, causing it to appear as a selectable “branch”. The fix filters the origin/HEAD ref before normalizing names, and adds a regression test to prevent reintroduction.

Changes:

• Switch git for-each-ref output to full refnames (%(refname)) and normalize via sed after filtering refs/remotes/origin/HEAD.
• Add a regression test that creates refs/remotes/origin/HEAD and asserts origin is not shown as a selectable entry.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
entire-fzf.plugin.zsh	Filters refs/remotes/origin/HEAD prior to name normalization to avoid the origin entry leak.
test/branch_filter_test.zsh	Adds coverage to ensure origin/HEAD does not surface as origin in the branch picker output.

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