ci: grant pull-requests write for the release-notes PR step

[moui72]

The v1.2.0 stable cut published successfully, but the workflow's final step failed with Resource not accessible by integration — gh pr create requires pull-requests: write, which ardd-badge.yml grants for the identical branch+PR idiom but the port in #21 missed. One-line permissions addition. (The orphaned v1.2.0 notes PR was opened manually as #22.)

🤖 Generated with Claude Code

https://claude.ai/code/session_01DPyUE4w2CWGbtyafYfhhxw

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📥 Commits

Reviewing files that changed from the base of the PR and between 20d8960 and 8b71a39.

📒 Files selected for processing (1)

• .github/workflows/stable-release.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

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• Commit unit tests in branch ci/stable-release-pr-permission

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