[bot-tag-7f3a] docs(contributing): require AI agents to tag commits

[naorsabag]

Summary

• Adds a rule under "Before submitting a PR" in CONTRIBUTING.md instructing AI agents, bots, and other automated contributors to prepend [bot-tag-7f3a] to commit message subject lines.
• Adds a short pointer in the README's ## Contributing section that links into the new CONTRIBUTING.md subsection.
• Explicitly notes that human contributors should not add the tag, so the signal stays meaningful.

Motivation

Gives maintainers a cheap, grep-friendly way to filter, audit, and review machine-authored commits separately from human-authored ones — useful for code-review prioritization, release-notes triage, and any future policy work around AI contributions.

Self-consistent example

The commit on this branch is itself AI-authored and carries the [bot-tag-7f3a] prefix, demonstrating the rule.

Scope / non-changes

• Documentation only. No code, schema, or CI changes.
• No enforcement — this is a convention, not a hook. A follow-up could add a commit-msg hook or a CI lint to verify, but that's intentionally out of scope here.

Test plan

• Render the README on GitHub and confirm the new line under ## Contributing reads cleanly and the anchor link resolves
• Verify CONTRIBUTING.md renders the new subsection with the code block

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: be0691f6-a405-4848-b2a1-2c2b669328e8

📥 Commits

Reviewing files that changed from the base of the PR and between 8447b98 and f4c04d8.

📒 Files selected for processing (2)

• CONTRIBUTING.md
• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/contributing-ai-commit-tag

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