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* checkout_pr: retry missing pull/N/head ref with PR-state guard Co-authored-by: Cursor <cursoragent@cursor.com> * checkout_pr tests: satisfy ToolState required fields Co-authored-by: Cursor <cursoragent@cursor.com> * checkout_pr: tighten retry-helper semantics (anneal round 1) Co-authored-by: Cursor <cursoragent@cursor.com> * checkout_pr: use retry util, drop retry tests * Update action/mcp/checkout.ts Co-authored-by: pullfrog[bot] <226033991+pullfrog[bot]@users.noreply.github.com> --------- Co-authored-by: Cursor <cursoragent@cursor.com> Co-authored-by: pullfrog[bot] <226033991+pullfrog[bot]@users.noreply.github.com>