Fix editor hang when launched without orchestrator

The JsonRpcClient was reading from stdin on startup, blocking forever
when no orchestrator process was piped in. Now defaults to disconnected
state and skips RPC calls, falling back to sample content.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

editor/src/main.cpp

@@ -24,24 +24,30 @@ private:
     FILE* rpc_in;   // For receiving responses from orchestrator
 
 public:
-    JsonRpcClient() : rpc_out(stdout), rpc_in(stdin) {}
-    
-    // Constructor that could connect to orchestrator process (simplified for now)
-    JsonRpcClient(FILE* out, FILE* in) : rpc_out(out), rpc_in(in) {}
-    
+    bool connected;
+
+    JsonRpcClient() : rpc_out(nullptr), rpc_in(nullptr), connected(false) {}
+
+    // Constructor that connects to orchestrator process
+    JsonRpcClient(FILE* out, FILE* in) : rpc_out(out), rpc_in(in), connected(out && in) {}
+
+    bool isConnected() const { return connected; }
+
     json call(const std::string& method, const json& params = json::object()) {
+        if (!connected) return json(nullptr);
+
         // Create the JSON-RPC request
         json request = json::object({
             {"jsonrpc", "2.0"},
             {"method", method},
             {"params", params},
-            {"id", 1}  // Simple ID for this example
+            {"id", 1}
         });
-        
+
         // Send the request to the orchestrator
         fprintf(rpc_out, "%s\n", request.dump().c_str());
         fflush(rpc_out);
-        
+
         // Read the response from the orchestrator
         char buffer[4096];
         if (fgets(buffer, sizeof(buffer), rpc_in)) {
@@ -58,7 +64,7 @@ public:
                 return json(nullptr);
             }
         }
-        
+
         return json(nullptr);
     }
 };