chore: Replace PR linter workflow with AGENTS.md instructions (FAC-814)

[DaveSkender]

Summary

Removes .github/workflows/lint-pull-request.yml and replaces it with a root AGENTS.md file that captures PR title conventions for AI agents.

This is part of the org-wide cleanup tracked in [FAC-814] — board-approved via approval 8cf810ad.

Changes

• Remove .github/workflows/lint-pull-request.yml
• Add AGENTS.md with PR title conventions

References

• FAC-814: General org-wide repo cleanup
• Board approval: 8cf810ad (FAC-814: Approve PRs for CODEOWNERS removal + PR linter workflow replacement)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository YAML (base), Central YAML (inherited)

Review profile: CHILL

Plan: Pro

Run ID: 1c0b83aa-b8c4-4780-9f7c-e54d1173ea59

📥 Commits

Reviewing files that changed from the base of the PR and between e43fa51 and d03ca0f.

📒 Files selected for processing (2)

• .github/workflows/lint-pull-request.yml
• AGENTS.md

✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch chore/fac-814-agents-md

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