feat(setup): add Git hook dispatcher generation

[chenjiahan]

Summary

This PR establishes the generated Git hook runtime needed by the upcoming rs setup installer. It creates shims for all 14 Husky-compatible client hooks and a shared runner dispatcher that finds user-managed hooks one directory above, forwards arguments and stdin, and preserves the hook exit status. Focused tests cover the generated file set and POSIX runtime behavior, including paths with spaces.

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ℹ️ Recent review info

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Configuration used: Organization UI

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Run ID: b44760c3-6cc9-48a5-9722-dc3ae2b37644

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Reviewing files that changed from the base of the PR and between 17ebbf4 and 37278e3.

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• README.md

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📝 Walkthrough

Walkthrough

Adds a typed createHookFiles() factory that generates Git hook shims and a shared runner dispatcher, including the pre-auto-gc hook. The dispatcher locates and executes user hooks while forwarding output and exit status. Tests verify the generated key set, shared shim contents, paths containing spaces, successful execution, and failure propagation. The dictionary adds applypatch and errexit, and the README adds a Husky credit.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: generating a Git hook dispatcher and shims for setup.
Description check	✅ Passed	The description matches the PR goals and change set, covering generated hooks, the runner, and tests.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chenjiahan/feat-git-hook-dispatcher

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