fix(self-update): a hung graceful shutdown no longer leaves a LaunchDaemon install down

On a KeepAlive LaunchDaemon (headless macOS) the updater restarts by sending
the server SIGTERM and letting launchd respawn it. launchd only respawns once
the process EXITS, and nothing escalates a stuck stop (systemd would SIGKILL
after TimeoutStopSec). Observed after an update to 1.32.1: the server closed
port 3000, server.stop() never resolved, the process stayed alive and the
service stayed down until it was killed by hand.

- cli.ts: the signal handler arms an unref'd 10s timer that force-exits if
  server.stop() hangs.
- self-update.sh (launchd-daemon): wait up to 30s for the server pid to exit,
  then SIGKILL it. tmux sessions live outside the server and survive.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

scripts/self-update.sh

@@ -285,7 +285,17 @@ case "$SUPERVISOR" in
     # domain needs root, but we don't need it — kill the server and launchd
     # respawns it on the new dist/ within ThrottleInterval seconds.
     if [[ -n "$SERVER_PID" ]] && kill "$SERVER_PID" 2>/dev/null; then
-      : # respawn is launchd's job from here
+      # Respawn is launchd's job, but only once the old process EXITS. A graceful
+      # shutdown that hangs leaves the port closed and the service down, so
+      # escalate to SIGKILL (tmux sessions live outside the server and survive).
+      for _ in $(seq 1 30); do
+        kill -0 "$SERVER_PID" 2>/dev/null || break
+        sleep 1
+      done
+      if kill -0 "$SERVER_PID" 2>/dev/null; then
+        echo "[self-update] server pid $SERVER_PID still alive 30s after SIGTERM, sending SIGKILL"
+        kill -9 "$SERVER_PID" 2>/dev/null || true
+      fi
     else
       MANUAL_CMD="sudo launchctl kickstart -k system/com.codeman.web"
       write_status "completed-needs-manual-restart" "Update staged — restart Codeman to apply v$TO_VERSION."

src/cli.ts

@@ -129,6 +129,8 @@ program
 
 /** Same registry the server resolves case names through (mirrors `case-routes.ts`). */
 const LINKED_CASES_FILE = dataPath('linked-cases.json');
+/** Graceful shutdown budget before the process force-exits (see the SIGTERM handler). */
+const SHUTDOWN_FORCE_EXIT_MS = 10_000;
 
 /**
  * Case name to directory, checking `linked-cases.json` FIRST and falling back to the
@@ -1002,6 +1004,14 @@ webCmd.action(async (options) => {
       if (shuttingDown) return;
       shuttingDown = true;
       console.log(palette.warn(`\n${signal} received, shutting down gracefully...`));
+      // A hung stop() must not keep the process alive: the listener is already
+      // closed by then, and a KeepAlive LaunchDaemon only respawns the server once
+      // it EXITS (systemd would SIGKILL after TimeoutStopSec; launchd does not).
+      // Seen after a self-update on macOS: port closed, process alive, service down.
+      setTimeout(() => {
+        console.error(palette.err(`Shutdown did not finish in ${SHUTDOWN_FORCE_EXIT_MS / 1000}s, forcing exit`));
+        process.exit(1);
+      }, SHUTDOWN_FORCE_EXIT_MS).unref();
       try {
         await server.stop();
       } catch (err) {