Add Ralph loop scaffold with guard, workflow, and state files#5

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Copilot wants to merge 8 commits intomainfrom

copilot/setup-ralph-loop

Commits on Jan 12, 2026

Initial plan
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Add Ralph loop scaffold

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acoyfellow
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Harden guard script

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Address review updates

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acoyfellow
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Refine guard diff scope

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acoyfellow
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Tighten guard checks

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acoyfellow
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Improve guard parsing

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acoyfellow
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Add workflow permissions

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acoyfellow
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