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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Reviewing files that changed from the base of the PR and between d7c1c0e and 83c72a8.

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• .github/workflows/auto-merge.yml

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