Add git rev-parse completions

[rasitakyol]

Summary

• add a git rev-parse signature with an optional variadic revision argument
• suggest local branches, remote branches, commits, and tags
• preserve the existing handwritten git.json signature structure

Closes #292.
Closes warpdotdev/warp#12319.

Testing

• ./script/presubmit (format, clippy, 76 tests, and doc tests)
• manual end-to-end verification in a local Warp build using this checkout as the command-signatures dependency

Screenshot

The completion menu shows the current branch, local and remote branches, a commit, and a tag for git rev-parse.

[oz-for-oss]

@rasitakyol

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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[oz-for-oss]

@rasitakyol

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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[rasitakyol]

Addressed the same-repository issue requirement: I created #292 and linked it from this PR with Closes #292. The issue is now awaiting the maintainer-applied ready-to-implement label; once that is set, I will re-trigger /oz-review.

[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.

Comment /oz-review on this pull request to retrigger a review (up to 3 times on the same pull request).

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

[oz-for-oss]

Overview

This PR adds a git rev-parse command signature with an optional variadic revision argument and wires it to the existing branch, commit, and tag generators.

Concerns

• No blocking correctness, security, or spec-drift concerns found in the annotated diff.

Verdict

Found: 0 critical, 0 important, 0 suggestions

Approve

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