ci / vet-and-test (pull_request) Successful in 41s
Why: run terminal status persists before the conversation claim is released; on the slow CI runner the rewind POST landed inside that window and got a 409. Retry the POST until the claim frees (bounded). Evidence: go test -count=5 ./internal/server/ -run TestRewindFilesHTTPHappy green; full suite green. Impact: test-only. Refs: Agent-System-Backend#94 #97