test(agents): fix unchecked test helper results

Explicitly discard errors stored by GORM and response write results in
mock handlers to satisfy errcheck.

Assisted-by: Codex:gpt-6

core/services/agentpool/collection_models_auth_test.go

@@ -23,18 +23,18 @@ var _ = Describe("knowledge-base models authorization", func() {
 			switch row := tx.Statement.Dest.(type) {
 			case *auth.User:
 				if failUser {
-					tx.AddError(fmt.Errorf("user lookup unavailable"))
+					_ = tx.AddError(fmt.Errorf("user lookup unavailable"))
 					return
 				}
 				*row = auth.User{ID: "alice", Role: role}
 			case *auth.UserPermission:
 				if failPermissions {
-					tx.AddError(fmt.Errorf("permissions unavailable"))
+					_ = tx.AddError(fmt.Errorf("permissions unavailable"))
 					return
 				}
 				*row = auth.UserPermission{UserID: "alice", AllowedModels: auth.ModelAllowlist{Enabled: true, Models: []string{"allowed"}}}
 			default:
-				tx.AddError(fmt.Errorf("unexpected query destination %T", row))
+				_ = tx.AddError(fmt.Errorf("unexpected query destination %T", row))
 			}
 		})).To(Succeed())
 		cfg := &state.AgentConfig{Name: "Research", EmbeddingModel: "denied"}

core/services/agentpool/collection_models_test.go

@@ -89,11 +89,11 @@ var _ = Describe("knowledge-base models", func() {
 			w.Header().Set("Content-Type", "application/json")
 			if strings.HasSuffix(r.URL.Path, "/rerank") {
 				rerankers = append(rerankers, body.Model)
-				w.Write([]byte(`{"results":[{"index":0,"relevance_score":0.9}]}`))
+				_, _ = w.Write([]byte(`{"results":[{"index":0,"relevance_score":0.9}]}`))
 				return
 			}
 			embeddings = append(embeddings, body.Model)
-			w.Write([]byte(`{"data":[{"embedding":[1,0,0],"index":0}],"model":"test","usage":{}}`))
+			_, _ = w.Write([]byte(`{"data":[{"embedding":[1,0,0],"index":0}],"model":"test","usage":{}}`))
 		}))
 		DeferCleanup(server.Close)
 		svc.appConfig.AgentPool.APIURL = server.URL + "/v1"