Fix error message to use correct CLI syntax

- Use 'ctxc' instead of 'context-connectors' (the actual binary name)
- Point users to 'ctxc index --help' instead of incorrect command syntax

Author: igor0

src/bin/cmd-mcp.ts

@@ -35,7 +35,7 @@ const stdioCommand = new Command("stdio")
         if (indexNames.length === 0) {
           console.error("Error: No indexes found.");
           console.error("The MCP server requires at least one index to operate.");
-          console.error("Create an index first: context-connectors index <path>");
+          console.error("Run 'ctxc index --help' to see how to create an index.");
           process.exit(1);
         }
       }
@@ -88,7 +88,7 @@ const httpCommand = new Command("http")
         if (availableIndexes.length === 0) {
           console.error("Error: No indexes found.");
           console.error("The MCP server requires at least one index to operate.");
-          console.error("Create an index first: context-connectors index <path>");
+          console.error("Run 'ctxc index --help' to see how to create an index.");
           process.exit(1);
         }
         indexNames = undefined;