feat: add one pull plug and play feature

server/internal/api/api_test.go

@@ -488,6 +488,77 @@ func TestListContainers_WithData(t *testing.T) {
 	}
 }
 
+// ── DeleteAgent ───────────────────────────────────────────────────────────────
+
+func TestDeleteAgent_Success(t *testing.T) {
+	h, s, reg, _ := newTestHandler(t)
+
+	_ = s.CreateAgentToken("a1", "t1", "host1")
+	reg.Register("a1", "host1", "", "ip", "arch", "os")
+
+	router := chi.NewRouter()
+	router.Delete("/api/v1/agents/{agentID}", h.DeleteAgent)
+
+	req, _ := http.NewRequest(http.MethodDelete, "/api/v1/agents/a1", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusNoContent {
+		t.Fatalf("expected 204, got %d — body: %s", w.Code, w.Body.String())
+	}
+
+	// Agent must be gone from store
+	_, err := s.GetAgent("a1")
+	if err == nil {
+		t.Error("expected store error after deletion, got nil")
+	}
+
+	// Agent must be gone from registry
+	_, ok := reg.Get("a1")
+	if ok {
+		t.Error("expected agent to be deregistered from registry")
+	}
+}
+
+func TestDeleteAgent_NotInRegistry(t *testing.T) {
+	h, s, _, _ := newTestHandler(t)
+
+	_ = s.CreateAgentToken("a1", "t1", "host1")
+	// Agent not registered in registry (offline agent)
+
+	router := chi.NewRouter()
+	router.Delete("/api/v1/agents/{agentID}", h.DeleteAgent)
+
+	req, _ := http.NewRequest(http.MethodDelete, "/api/v1/agents/a1", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	if w.Code != http.StatusNoContent {
+		t.Fatalf("expected 204 even when not in registry, got %d — body: %s", w.Code, w.Body.String())
+	}
+
+	_, err := s.GetAgent("a1")
+	if err == nil {
+		t.Error("expected store error after deletion, got nil")
+	}
+}
+
+func TestDeleteAgent_NonExistent(t *testing.T) {
+	h, _, _, _ := newTestHandler(t)
+
+	router := chi.NewRouter()
+	router.Delete("/api/v1/agents/{agentID}", h.DeleteAgent)
+
+	req, _ := http.NewRequest(http.MethodDelete, "/api/v1/agents/ghost", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, req)
+
+	// DELETE on a non-existent ID is still 204 (idempotent)
+	if w.Code != http.StatusNoContent {
+		t.Fatalf("expected 204 for non-existent agent, got %d — body: %s", w.Code, w.Body.String())
+	}
+}
+
 // ── ContainerAction ───────────────────────────────────────────────────────────
 
 func TestContainerAction_AgentNotConnected(t *testing.T) {