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/main.c

@@ -684,7 +684,7 @@ int main(int argc, char **argv) {
                                           : getenv("CST_INSTANCE_ID");
     if (!iid || !iid[0])
       iid = "chair-local";
-    int rc = cst_parliament_cli_login(pw, iid, realm_label);
+    int rc = cst_parliament_cli_login(pw, iid, realm_label, discover_peer_port);
     curl_global_cleanup();
     return rc;
   }
@@ -769,8 +769,10 @@ int main(int argc, char **argv) {
           return 1;
         }
         free(hand);
-        (void)cst_parliament_daemon_start(pw, iid, discover_peer_port, err,
-                                          sizeof(err));
+        if (cst_parliament_daemon_start(pw, iid, discover_peer_port, err,
+                                        sizeof(err)) != 0)
+          fprintf(stderr, "warning: parliament service: %s\n",
+                  err[0] ? err : "start failed");
       } else {
         fprintf(stderr,
                 "password Realm active: run --login (or set "