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The CI runs go test with -race; the agent runner has two pump goroutines (pumpStdout + pumpStderr) writing through the sender concurrently, and the unprotected fakeSender slice append raced. The cancel_test had a local 'safeSender' workaround for the same issue; promote that mutex onto fakeSender itself so every test in the package is race-clean without per-test variants. - fakeSender grows mu sync.Mutex; Send takes/releases. New snapshot() helper for tests that want a stable copy. - cancel_test drops its local safeSender + sync import; uses fakeSender. Verified: go test -race ./... passes across all packages.