chore: remove auto-merge.yml

[OriginalGary]

Removes the Wave 0 auto-merge workflow. Merge is operator-driven via the /merge command — the auto-merge gate used a stale level-0/1/2/3 taxonomy that the pipeline replaced with auto:auto-fixable / auto:requires-human / stage:*. Org-wide protected-main ruleset (id 11439705) continues to enforce approval + linear history + CodeQL gates.

Refs Open-Paws/structured-coding-with-ai#41

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

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📥 Commits

Reviewing files that changed from the base of the PR and between bf5d6be and b5c95cd.

📒 Files selected for processing (1)

• .github/workflows/auto-merge.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/remove-auto-merge

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

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