ci: route all macOS runners through Blacksmith - #6650

Bugbot Analysis Progress (56s elapsed)

✅ Gathered PR context (5s)
✅ Completed bug detection (51s)
✅ Posted analysis results (1s)

Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_3ccf24c8-4bc4-4405-836f-9697c8ab175b