fix(types): add _telemetry_timestamp to Agent contract to resolve typecheck in agent_store.test

Author: DDS-Solutions

src/contracts/agent/domain.ts

@@ -59,6 +59,7 @@ export interface Agent {
     reasoning_depth?: number;
     workspace_path?: string;
     _local_timestamp?: number;
+    _telemetry_timestamp?: number;
     active_mission?: { 
         id: string;
         objective?: string;

src/stores/agent_store.ts

@@ -43,7 +43,7 @@ export const use_agent_store = <T = Agent_Store_State>(
     const agents = raw_agents.map(agent => {
         const live = telemetry.live_status[agent.id];
         if (live) {
-            const is_local_newer = (agent._local_timestamp || 0) >= ((live as { _telemetry_timestamp?: number })._telemetry_timestamp || 0);
+            const is_local_newer = (agent._local_timestamp || 0) >= (live._telemetry_timestamp || 0);
             if (is_local_newer) {
                 return {
                     ...live,