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* test(pilot): in-process simulation of mid-tunnel disconnects The PR #979 hardening added per-stream idle timers, drain handling, paused-request maps, and a tcpAwaitingDrain set on the bridge. None of those cleanup paths had an end-to-end test driving them through a real disconnect. A future refactor that inverts the order of clearIdleTimer + streams.delete (or that misses one of the aux maps) would leak per-tunnel memory in a way unit tests cannot catch. Spin up a real http.Server with attachUpgrade and a real ws.WebSocket client (same self-contained pattern as pilot-tunnel-integration.test.ts). Four cases: - HTTP request mid-flight: open a real loopback HTTP request, wait for the bridge to forward http_req to the agent, terminate the agent WS, assert the loopback request resolves with 502 (the teardownStream path) and the manager marks the node Offline. - TCP stream with bytes outstanding: openTcpStream from the bridge, ack open from the test agent, write some bytes, terminate the tunnel, assert the TcpStream emits 'close' and the bridge is gone from the manager. - Reconnect with the long-lived token after a clean close does NOT bump tunnels_replaced (no live tunnel to replace). - Reconnect WHILE the prior tunnel is still live DOES bump tunnels_replaced. Inverse case proves the counter wiring is correct in both directions. Self-contained: no shared helper modules, no dependencies on other in-flight pilot test files. Can land independently of PRs #982, #983, or #985. * test(pilot): address PR E code-review on disconnect tests Two small findings: - Defensive: attach a no-op 'error' listener on the TcpStream in test #2 after the 'open' event has fired. teardownStream only emits 'error' for unaccepted streams today, so the listener is not exercised; the listener exists so a future refactor that delays accepted=true past 'open' cannot crash the worker on an unhandled 'error' event. - Removed a stale cross-file reference in the header comment that pointed at pilot-tunnel-integration.test.ts; that file lives in a separate in-flight branch and does not exist on main. No behavior change. All 4 disconnect tests pass. * chore(test): drop unused PROTOCOL_VERSION import The import was leftover from an earlier draft and ESLint flagged it as no-unused-vars (error level for symbols not prefixed with _), failing the lint job in CI.