Make daemon shutdowns easier to diagnose (#1790)

* fix(daemon): log stop reasons and client identity

Record websocket client identity, process memory/uptime, and shutdown reasons across CLI, desktop, supervisor, and worker paths so daemon drops can be traced from the triggering client to worker termination.

* fix(daemon): keep shutdown diagnostics in sync

Test drift: supervisor and relay tests still asserted the old log text and metadata shape after shutdown diagnostics started logging structured reasons and relay connection ids. Update those assertions to the new diagnostic contract.

Also centralize client lifecycle reason normalization and derive desktop daemon stop reasons from one tuple so future changes cannot silently drift.

packages/app/src/desktop/daemon/desktop-daemon.ts

@@ -2,6 +2,14 @@ import { getDesktopHost, isElectronRuntime } from "@/desktop/host";
 import { invokeDesktopCommand } from "@/desktop/electron/invoke";
 
 export type DesktopDaemonState = "starting" | "running" | "stopped" | "errored";
+export type DesktopDaemonStopReason =
+  | "manual_ipc"
+  | "settings"
+  | "host_remove"
+  | "quit"
+  | "app_update"
+  | "version_mismatch"
+  | "restart";
 
 export interface DesktopDaemonStatus {
   serverId: string;
@@ -122,8 +130,10 @@ export async function startDesktopDaemon(): Promise<DesktopDaemonStatus> {
   return parseDesktopDaemonStatus(await invokeDesktopCommand("start_desktop_daemon"));
 }
 
-export async function stopDesktopDaemon(): Promise<DesktopDaemonStatus> {
-  return parseDesktopDaemonStatus(await invokeDesktopCommand("stop_desktop_daemon"));
+export async function stopDesktopDaemon(
+  reason: DesktopDaemonStopReason = "manual_ipc",
+): Promise<DesktopDaemonStatus> {
+  return parseDesktopDaemonStatus(await invokeDesktopCommand("stop_desktop_daemon", { reason }));
 }
 
 export async function restartDesktopDaemon(): Promise<DesktopDaemonStatus> {

packages/app/src/desktop/hooks/use-built-in-daemon-management.ts

@@ -60,7 +60,7 @@ export function useBuiltInDaemonManagement(
             }),
           persistSettings: (next) => updateSettings(next) as Promise<void>,
           startDaemon: startDesktopDaemon,
-          stopDaemon: stopDesktopDaemon,
+          stopDaemon: () => stopDesktopDaemon("settings"),
         });
         if (result.kind === "enabled") {
           const upsertResult = await upsertDesktopDaemonConnection(

packages/app/src/screens/settings/host-page.tsx

@@ -1244,7 +1244,7 @@ function RemoveHostSection({
           await updateSettings({ daemon: { manageBuiltInDaemon: false } });
           didDisableDaemonManagement = true;
           if (daemonStatus?.status === "running" && daemonStatus.desktopManaged) {
-            setStatus(await stopDesktopDaemon());
+            setStatus(await stopDesktopDaemon("host_remove"));
             didStopDaemon = true;
           }
           await removeHost(host.serverId);