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* Keep connections alive through brief daemon slowdowns The active connection's liveness check was a side effect of the candidate-probe loop: a single 5s latency measurement doubled as the death timeout, so a daemon that was alive but briefly stalled (e.g. a busy event loop) was misread as dead and the connection was torn down. Give DaemonClient its own self-scheduling heartbeat that solely owns liveness (15s timeout, 2 consecutive misses), and make the probe read-only on the active connection — it reads the heartbeat's last RTT instead of pinging. Split the shared ping into a pure measurement path (measureLatency) and a private liveness path, so nothing outside the client can drive teardown. * Don't let a candidate latency timeout count as a liveness failure The heartbeat (livenessPing) and candidate ranking (measureLatency) share one in-flight ping slot. If a heartbeat tick lands while a candidate measurement is still in flight, the heartbeat dedupes onto it — and a measurement timeout was then recorded as a liveness failure, nudging the connection one step closer to a spurious teardown. Tag each ping with whether its timeout may drive a liveness failure (only the heartbeat sets it) and gate recordLivenessFailure on that flag, so an adopted measurement probe can never contribute to teardown.