Summary

• fix downstream experiment-validation label step so planner no longer fails red on 422
• classify low-risk automation tasks into ready-to-merge vs draft-only buckets
• add CI-gated auto-merge workflow plus changed-file guardrails for sensitive paths

Verification

• python3 -m unittest tests/test_prepare_auto_optimization_pr.py tests/test_auto_optimization_pr_workflow_config.py tests/test_monthly_optimization_planner_workflow_config.py
• uvx ruff check scripts tests
• ruby YAML parse for planner + automation workflows