feat(skills): add arc skill for composable workflow orchestration 🤖🤖🤖#1406

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pconnelly-nuance:feature/arc-skill

Commits on Apr 15, 2026

feat(skills): add arc skill for composable LLM agent orchestration

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Update skills/arc/examples/tdd-cycle.arc.yml

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Update skills/arc/references/file-format.md

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