docs: add compliance evidence checklist

[DevOpsAIguru123]

Summary

• Add a compliance evidence checklist for production-adjacent agent runs
• Link the checklist from the README scoring section
• Document required approval records, redaction rules, identity/data boundaries, and evidence-packet fields

Validation

• python3 scripts/validate_repos_yaml.py
• . .venv/bin/activate && python scripts/validate_repos_yaml.py && python -m pytest -q

Notes

• This is docs-only and does not change catalog scoring or executable behavior.