fix(agents): block call_omo_agent from Prometheus planner (#772)

Prometheus (Planner) agent should not have access to call_omo_agent tool
to prevent direct agent spawning. Uses the same pattern as orchestrator-sisyphus.

Co-authored-by: justsisyphus <justsisyphus@users.noreply.github.com>

src/plugin-handlers/config-handler.ts

@@ -305,6 +305,12 @@ export function createConfigHandler(deps: ConfigHandlerDeps) {
         call_omo_agent: false,
       };
     }
+    if (agentResult["Prometheus (Planner)"]) {
+      (agentResult["Prometheus (Planner)"] as { tools?: Record<string, unknown> }).tools = {
+        ...(agentResult["Prometheus (Planner)"] as { tools?: Record<string, unknown> }).tools,
+        call_omo_agent: false,
+      };
+    }
 
     config.permission = {
       ...(config.permission as Record<string, unknown>),