refactor: move resetAllLanes() from heartbeat-wake to restart coordinators

Addresses review concern that setHeartbeatWakeHandler() had a surprising
cross-cutting side effect by calling resetAllLanes(), coupling heartbeat
handler registration to command-queue global state.

The lane reset now lives in the restart loop (run-loop.ts and
gateway-daemon.ts), which is the correct abstraction level — only
in-process restart coordinators need to know about stale lane state.

setHeartbeatWakeHandler() still resets its own module-level state
(running, scheduled, timer) which is properly scoped.

src/cli/gateway-cli/run-loop.ts

@@ -6,7 +6,11 @@ import {
   isGatewaySigusr1RestartExternallyAllowed,
 } from "../../infra/restart.js";
 import { createSubsystemLogger } from "../../logging/subsystem.js";
-import { getActiveTaskCount, waitForActiveTasks } from "../../process/command-queue.js";
+import {
+  getActiveTaskCount,
+  resetAllLanes,
+  waitForActiveTasks,
+} from "../../process/command-queue.js";
 
 const gatewayLog = createSubsystemLogger("gateway");
 
@@ -114,7 +118,18 @@ export async function runGatewayLoop(params: {
     // Keep process alive; SIGUSR1 triggers an in-process restart (no supervisor required).
     // SIGTERM/SIGINT still exit after a graceful shutdown.
     // eslint-disable-next-line no-constant-condition
+    let isFirstIteration = true;
     while (true) {
+      if (!isFirstIteration) {
+        // After an in-process restart (SIGUSR1), reset command-queue lane state.
+        // Interrupted tasks from the previous lifecycle may have left `active`
+        // counts elevated (their finally blocks never ran), permanently blocking
+        // new work from draining. This must happen here — at the restart
+        // coordinator level — rather than inside individual subsystem init
+        // functions, to avoid surprising cross-cutting side effects.
+        resetAllLanes();
+      }
+      isFirstIteration = false;
       server = await params.start();
       await new Promise<void>((resolve) => {
         restartResolver = resolve;