Fix MCP action routing for workspace_db_query

vibn-agent-runner/src/tools/vibn-tools.ts

@@ -1879,7 +1879,8 @@ export async function executeMcpTool(
   if (toolName === "http_fetch") return executeHttpFetch(args);
 
   // Convert underscore tool name → dotted MCP action (apps_create → apps.create)
-  const action = toolName.replace(/_/g, ".");
+  let action = toolName.replace(/_/g, ".");
+  if (toolName === "workspace_db_query") action = "workspace.db_query";
 
   // Unpack JSON-string args (Gemini schemas can't represent free-form objects,
   // so we accept *Json string fields and parse them server-side).