refactor(ci): add shared ci success

[jbeckwith-oai]

Summary

• add first-party validation for the checked-in action bundle and metadata
• add a separate CI Success workflow using the shared org action
• keep the validation dependency-free and text-only

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Run bundle syntax checks with Node 20

Use the same Node major as the action runtime when validating bundles. action.yml declares runs.using: node20, but this workflow installs Node 24 before node --check, so newer syntax can pass CI yet crash when the action executes on GitHub's Node 20 runtime.

Useful? React with 👍 / 👎.

[chatgpt-codex-connector]

Pin the shared CI action to an immutable ref

Avoid @main for workflow actions. Referencing a moving branch lets upstream changes alter or break PR-gating behavior without changes in this repo, and if the upstream branch is compromised it can execute attacker-controlled logic in CI. Pin to a commit SHA for integrity.

Useful? React with 👍 / 👎.