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ServiceSupervisor.start(), when probeBeforeSpawn detects an already-healthy instance on the target port, "adopts" it (marks the service running without spawning a duplicate that would die with EADDRINUSE). This adopt path calls setToolStatus(tool, "running") with no pid argument at all, so this.pid stays at its constructor default of null for the rest of that supervisor's life -- only the spawn path (a genuinely new child process) ever sets a real pid. In production this "adopt" path is common, not an edge case: any embedded sidecar service (cliproxy, 9router, bifrost, mux) whose child process survives a `systemctl --user restart omniroute.service` gets adopted by the new supervisor instance on the next start(), and its pid is lost from that point on -- even though the service is genuinely healthy and running. The observed symptom: a service shows state "running" but pid null, and something downstream that keys liveness tracking off pid eventually treats it as untrustworthy/stale despite nothing actually being wrong. Fix: resolve the real pid of the process holding the port (via `lsof -ti :<port>`, best-effort -- a lookup failure leaves pid null rather than blocking adoption) and record it the same way the spawn path does. An existing test asserted pid === null on adopt. That was accurate for the old behavior but reflected a missing resolution, not a deliberate "adopted services never get a pid" design choice -- updated its assertion to match the corrected behavior and added a dedicated regression test proving the resolved pid matches the real process actually bound to the port.