Add eta-mu GitHub workflows

[riatzukiza]

Summary

• add the shared eta-mu event workflow wrapper
• add the eta-mu-review-gate workflow so unresolved CodeRabbit review threads can become a required merge gate

Notes

• intended required check context: coderabbit-review-gate
• intended branch protection still relies on native review-thread resolution as well
• rollout source: open-hax/codex via devel automation

[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (2)

• .github/workflows/eta-mu-review-gate.yml is excluded by none and included by none
• .github/workflows/eta-mu.yml is excluded by none and included by none

CodeRabbit blocks several paths by default. You can override this behavior by explicitly including those paths in the path filters. For example, including **/dist/** will override the default block on the dist directory, by removing the pattern from both the lists.

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: d54fc10f-772d-42c2-bf43-6b02612cabdf

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch eta-mu-rollout-20260321

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