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

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📥 Commits

Reviewing files that changed from the base of the PR and between 749a6bb and aa7f74d.

📒 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

• 🛠️ fix NAV violations: Commit on current branch
• 🛠️ fix NAV violations: Create PR

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