Phase 3: Health Check + Task Queue for Agent Tab

Backend: _get_agent_health() with CPU/Memory/Threads from ps, get_agent_tasks() reads tasks.json. API: GET /api/agents/{id}/health + /tasks. Frontend: Health metrics block in Overview tab (CPU, Memory bar, Threads), Tasks tab with status-colored task list.

api/routes.py

@@ -867,6 +867,20 @@ def handle_get(handler, parsed) -> bool:
             limit = int(parse_qs(parsed.query).get("limit", ["20"])[0])
             return j(handler, _agents.get_agent_chat_history(agent_id, limit=limit))
 
+    # GET /api/agents/{id}/health
+    if parsed.path.startswith("/api/agents/") and "/health" in parsed.path:
+        parts = parsed.path.split("/")
+        if len(parts) == 5 and parts[4] == "health":
+            agent_id = parts[3]
+            return j(handler, _agents.get_agent_health(agent_id))
+
+    # GET /api/agents/{id}/tasks
+    if parsed.path.startswith("/api/agents/") and "/tasks" in parsed.path:
+        parts = parsed.path.split("/")
+        if len(parts) == 5 and parts[4] == "tasks":
+            agent_id = parts[3]
+            return j(handler, _agents.get_agent_tasks(agent_id))
+
     # ── Profile API (GET) ──
     if parsed.path == "/api/profiles":
         from api.profiles import list_profiles_api, get_active_profile_name