ci(release): make GitHub-release job idempotent

[Liohtml]

Follow-up to #48. The v0.3.0 tag run (29561730067) went: verify ✅, publish ✅ (skipped — 0.3.0 already on crates.io), create GitHub release ❌ with HTTP 422: Release.tag_name already exists, because the release had been created manually in the UI.

This makes the release-creation step skip when a release for the tag already exists — mirroring the idempotent publish step — so a manual UI release or a job re-run no longer fails the workflow.

No impact on v0.3.0 itself: the crate is published and the GitHub release exists; this only prevents the cosmetic red X on future tags.

🤖 Generated with Claude Code

https://claude.ai/code/session_01HHcB7Dhren7PSwn4va8BKv

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Configuration used: defaults

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Run ID: 87020b48-c5ca-4ad0-9a92-95a6a5ead3a9

📥 Commits

Reviewing files that changed from the base of the PR and between 0eb236f and 0948a79.

📒 Files selected for processing (1)

• .github/workflows/release.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/project-analysis-crates-release-kqf0k9

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