Add AI usage disclosure guidelines to CONTRIBUTING.md

[meili-bot]

This PR is auto-generated.

This PR adds guidelines about AI tool usage in contributions:

• New "Coding with AI" section explaining our policy on AI-assisted contributions
• Reminder in step 5 of "How to Contribute" about disclosing AI usage

Our policy: AI usage is accepted, provided contributors disclose it in their PR description. This transparency helps maintainers during code review.

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Reviewing files that changed from the base of the PR and between 6003393 and 52c2da1.

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• CONTRIBUTING.md

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