[codex] serialize release-plz jobs

[ScriptedAlchemy]

Summary

Serializes the release-plz workflow so the release PR updater waits for the publish/release job.

Root Cause

When PR #48 merged, release-plz release and release-plz release-pr ran concurrently. The release-pr job opened a duplicate v0.0.2 PR (#51) before the publish/release path finished; that PR tried to delete old planning/spec docs and has been closed.

Change

• Add needs: release-plz-release to the release-plz-pr job.

This preserves the normal flow on feature merges: the release job quickly skips non-release commits, then the release-pr job opens/updates the next release PR. On release-PR merges, it waits for publishing to complete first.

Validation

• actionlint .github/workflows/*.yml
• parsed all workflow YAML files with PyYAML
• parsed release-plz.toml with tomllib
• git diff --check

[changeset-bot]

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Latest commit: 2baf5d1

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