Add git update-ref completions

[SkyNotSilent]

Summary

• add a git update-ref completion spec with refs, values, and supported options
• add a reusable refs generator that completes full refs/... names from git for-each-ref
• cover ref post-processing with a unit test

Closes #287.
Addresses warpdotdev/warp#12322.

Testing

• npm run format:check -- command-signatures/json/git.json
• cargo fmt --check
• cargo test -p warp-command-signatures git::tests::test_post_process_refs
• cargo test -p warp-command-signatures
• cargo test
• cargo clippy --workspace --all-targets -- -D warnings
• script/presubmit
• manual temp repo check: git for-each-ref --format="%(refname)" --sort="refname" "refs/**" includes refs/remotes/origin/main

Notes

• No Warp GUI screenshot included; this change is in the command-signatures package and is covered by generator/spec validation plus a manual git refs check.

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[oz-for-oss]

@SkyNotSilent

Every PR must be linked to a same-repo issue before Oz can review it.

This PR is linked to #287, but no linked issue is marked ready-to-implement yet. Only repository maintainers apply that label, so please wait for a maintainer to mark the issue. Once it is marked, push a new commit or comment /oz-review to re-trigger review.

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[oz-for-oss]

@SkyNotSilent

Every PR must be linked to a same-repo issue before Oz can review it.

Next step: open or find a same-repo issue describing this change, then link it to this PR by adding Closes #123 to the PR description (or using the "Development" sidebar on GitHub). A maintainer will mark the issue ready-to-implement when it is ready. Once it is marked, comment /oz-review to re-trigger review.

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[SkyNotSilent]

/oz-review

[oz-for-oss]

@SkyNotSilent

Every PR must be linked to a same-repo issue before Oz can review it.

This PR is linked to #287, but no linked issue is marked ready-to-implement yet. Only repository maintainers apply that label, so please wait for a maintainer to mark the issue. Once it is marked, push a new commit or comment /oz-review to re-trigger review.

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[acarl005]

/oz-review

[oz-for-oss]

@acarl005

I'm re-reviewing this pull request in response to a review request.

You can view the conversation on Warp.

I reviewed this pull request and requested human review from: @acarl005.

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[acarl005]

@SkyNotSilent Sorry this one fell through the cracks! I added the label the bot needed so now we're good to push this forward.

Oz no longer requests changes for this pull request after the latest automated review.

[oz-for-oss]

Overview

Adds a git update-ref command signature plus a reusable refs generator for completing full refs/... names. The generator output is deduplicated, filtered, and covered by a focused unit test.

Concerns

No blocking concerns found. No approved spec context was available for this PR, and the security pass did not identify security-relevant issues in the changed lines.

Verdict

Found: 0 critical, 0 important, 0 suggestions

Approve

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[acarl005]

For the group --deref / --no-deref they differ from the other boolean pairs.

--stdin/--no-stdin and --create-reflog/--no-create-reflog are each a single entry with an array name field. --deref and --no-deref follow the same --[no-] pattern but are listed as two separate entries. For consistency:

{
    "name": ["--no-deref", "--deref"],
    "description": "Update the ref itself instead of the one it points to (default: follow symrefs)"
}

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