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

[OriginalGary]

Summary

Removes this repo's .github/workflows/auto-merge.yml caller. The org-level reusable workflow it called (Open-Paws/.github/.github/workflows/auto-merge.yml) is being deleted in Open-Paws/.github#16, so this caller would error on the next PR event anyway.

Why

Part of the org-wide label-schema unification. Layer-3 dispatcher is stopped. Companion PRs:

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

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 677004a8-21a6-416d-a10d-ccccfa332cbf

📥 Commits

Reviewing files that changed from the base of the PR and between 316824b and d7ba103.

📒 Files selected for processing (2)

• .github/workflows/auto-merge.yml
• .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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