chore: strip label-convention enforcement (schema unification prep)

[OriginalGary]

Summary

Removes this repo's .github/workflows/setup-labels.yml workflow. The labels it created are being torn down org-wide as part of a label-schema unification.

Why

Layer-3 dispatcher is stopped. Label definitions are being deleted across all 30 repos in parallel. Companion PRs:

• Open-Paws/context#120
• Open-Paws/structured-coding-with-ai#49
• Open-Paws/.github#16

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

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Run ID: 869a8feb-d77d-475b-961a-e985f1306184

📥 Commits

Reviewing files that changed from the base of the PR and between b47211b and 2e59851.

📒 Files selected for processing (1)

• .github/workflows/setup-labels.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/strip-label-conventions-2026-04-28

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