chore: update the CONTRIBUTING.md and AI_POLICY.md with shared content

[holochain-release-automation2]

This PR updates the CONTRIBUTING.md and AI_POLICY.md files with the content from the shared files in the hc-github-config repo.

[cocogitto-bot]

✔️ 8d4bd39...b9aae0a - Conventional commits check succeeded.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: eda22270-f75b-4748-8585-51e869ce287e

📥 Commits

Reviewing files that changed from the base of the PR and between df58812 and b9aae0a.

📒 Files selected for processing (2)

• AI_POLICY.md
• CONTRIBUTING.md

Included review availability: Your plan includes up to 1 review per rolling hour; 0 remain after this review.

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Walkthrough

Added AI_POLICY.md with requirements for human accountability, AI-use disclosure, content attribution, translation, licensing, enforcement, and prohibited conduct. Updated CONTRIBUTING.md to require contributors who use AI tools to read and follow the policy.

Merge Risk: ⚪ Minimal · up to b9aae

This change updates repository guidance documents only and introduces no actionable merge-blocking risk; it is merge-ready after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the updates to CONTRIBUTING.md and AI_POLICY.md and matches the pull request objectives.
Description check	✅ Passed	The description accurately states that both files receive shared content from the hc-github-config repository.
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 chore/update-contributing-guide

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