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CedarCopilot/cedar-mail

Branch: staging

feat(agents): retire model and when_to_use as separate frontmatter concepts

merged#2707CedarCopilot

CedarCopilot wants to merge 4 commits into staging from feat/retire-model-and-when-to-use

run 140eeca2-333a-45b0-9e22-fd0f88755123, completed Sep 6, 2026, 7:50 PM