chore: remove unused Slack announce job, add issues:write permission

[jack-arturo]

Summary

• Removes the unused announce job (Slack webhook) from the release-please workflow
• Adds missing issues: write permission required by release-please-action@v4

Part of cross-repo cleanup — no Slack webhooks are configured.

Made with Cursor

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📥 Commits

Reviewing files that changed from the base of the PR and between 44faa6d and 41fe7bd.

📒 Files selected for processing (1)

• .github/workflows/release-please.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

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