Method backstopShouldExit

src/mcp/daemon.ts:467–477

* Decide whether the inactivity backstop should reap the daemon right now. * Public + `isAlive`-injected for deterministic tests; the timer calls it each * tick with the real liveness probe. * * The backstop exists ONLY to catch a **phantom** client (#692) — one counted * but actually

(isAlive: (pid: number) => boolean)

   * client keeps the daemon up. Has the sweep's side effect (drops dead peers).
   */
  backstopShouldExit(isAlive: (pid: number) => boolean): boolean {
    if (this.stopping || this.clients.size === 0) return false; // idle timer owns the no-client case
    if (Date.now() - this.lastActivityAt < this.maxIdleMs) return false; // still within the window
    this.reapDeadClients(isAlive);
    if (this.clients.size === 0) return false; // sweep cleared them — idle timer takes over
    const anyProvablyAlive = [...this.clients].some((session) => {
      const peers = this.clientPeers.get(session);
      return peers != null && peers.pid !== null && !peerIsDead(peers, isAlive);
    });
    return !anyProvablyAlive;
  }

  /**
   * Drop every connected client whose peer process is gone. Returns the count