fix(daemon): tear down daemon when destroying all servers with no entries

src/daemon.ts

@@ -203,6 +203,12 @@ async function handle(req: DaemonRequest): Promise<DaemonResponse> {
         for (const entry of toDestroy) {
           evict(entry, "manual destroy");
         }
+        // Full Shutdown - If destroying all servers and nothing is left
+        // (including the case where no entries existed), tear down the
+        // daemon so it doesn't sit idle.
+        if (!req.serverId && entries.size === 0) {
+          setImmediate(() => shutdownDaemon("destroy all"));
+        }
         return {
           id: req.id,
           ok: true,
@@ -223,8 +229,6 @@ async function handle(req: DaemonRequest): Promise<DaemonResponse> {
       error: (err as Error)?.message ?? String(err),
     };
   }
-  // Exhaustiveness - Should be unreachable given the union above.
-  throw new Error("unreachable");
 }
 
 // Handle Connection - Reads NDJSON from a client socket; each line is one