docs(pre-commit): publish supported hook design

[Jamie-BitFlight]

Why

#745 intentionally shipped the provider before changing the consumer README because the existing v2 tag did not yet contain the hook. Release 2.1.0 is now published, so the public guidance can be corrected.

This also fixes a deeper pre-commit design issue: a moving major tag is not a reliable rev. pre-commit caches hook repositories by repository + revision string, so an existing rev: v2 cache is not guaranteed to refresh when that tag moves.

Changes

• Replace the README's old repo: local workaround with the published hook.
• Document an immutable rev: v2.1.0 and pre-commit autoupdate for upgrades.
• Clarify that action and README paths are configurable while the config file remains .ghadocs.json.
• Add the durable provider design to docs/tool-contract.md: consumer Node/npm runtime, exact npm-version binding, argument forwarding, no staged filenames, and immutable release refs.
• Route published pre-commit work correctly from AGENTS.md instead of treating all Git-hook work as Husky.
• Extend the integration smoke test to execute the exact documented release tag in addition to the PR-head provider.

Verification target

The existing PR-head smoke must still prove argument forwarding, mutation detection, and idempotence. The added release smoke must prove that the copy/paste v2.1.0 configuration resolves and updates the configured README while leaving the default README alone.

[Jamie-BitFlight]

@codex review

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-13T11:40:56.184302Z	c5ab23f	Manual request

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📥 Commits

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• AGENTS.md
• README.md
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[Jamie-BitFlight]

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Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	94.05%	1012 / 1076
🔵	Statements	94.18%	1037 / 1101
🔵	Functions	96.95%	159 / 164
🔵	Branches	88.26%	564 / 639

File Coverage

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Generated in workflow #1157 for commit c5ab23f by the Vitest Coverage Report Action

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. More of your lovely PRs please.

Reviewed commit: c5ab23f5c4

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[Jamie-BitFlight]

🎉 This PR is included in version 2.1.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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