fix: parliament UX, prompt alignment, execution nudges (0.9.14)

Inject shared parliament context into the agent environment, switch
prompts away from in-process workers when parliament is active, clear
login tickets on chair sync/new-project, and surface realm/chair/service
in /status. Tighten empty-reply handling and prefer-tool principles.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/parliament_cli.c

@@ -68,9 +68,9 @@ int cst_parliament_cli_realm_password_init(const char *password) {
 }
 
 int cst_parliament_cli_login(const char *password, const char *instance_id,
-                             const char *device_label) {
+                             const char *device_label, int peer_port) {
   return cst_parliament_cli_login_and_serve(password, instance_id, device_label,
-                                            9100);
+                                            peer_port > 0 ? peer_port : 9100);
 }
 
 int cst_parliament_cli_login_and_serve(const char *password,
@@ -88,8 +88,10 @@ int cst_parliament_cli_login_and_serve(const char *password,
   if (cst_parliament_daemon_start(password, instance_id,
                                   peer_port > 0 ? peer_port : 9100, err,
                                   sizeof(err)) != 0) {
-    fprintf(stderr, "service: %s\n", err[0] ? err : "start failed");
-    return 1;
+    fprintf(stderr, "warning: service: %s (chair login still valid)\n",
+            err[0] ? err : "start failed");
+    printf("service=failed\n");
+    return 0;
   }
   if (cst_parliament_daemon_running())
     printf("service=running\n");