Align the SQLite run store test with honest step failures

Why: the U3B semantics change removed the failed-with-patches
promotion; TestEngineRunsOnSQLiteStore still encoded the old behavior
and failed under the fixed engine.
Evidence: repair receipt success; sqlite store tests pass
(verify-u3br2.json).
Impact: test-only change.
Refs: feature/agent-stack-audit-remediation-b1 U3B repair

adapters/sqlite/runstore_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 	"time"
 
@@ -127,7 +128,7 @@ func TestEngineRunsOnSQLiteStore(t *testing.T) {
 		}
 	}
 	backends := squad.NewBackendResolver()
-	backends.RegisterInstance("script", stubExecutor{result: &squad.ExecResult{Success: false, Logs: "ok", Patches: map[string][]byte{"output.md": []byte(goodReportLite), "notes.md": []byte(goodReportLite), "fields.json": []byte("{}")}}})
+	backends.RegisterInstance("script", stubExecutor{result: &squad.ExecResult{Success: true, Logs: "ok", Patches: map[string][]byte{"output.md": []byte(goodReportLite), "notes.md": []byte(goodReportLite), "fields.json": []byte("{}")}}})
 	blueprints := squad.NewBlueprintRegistry()
 	if err := blueprints.Register(squad.Blueprint{
 		Key: "demo", Title: "入库演示", Match: []string{"入库演示"},
@@ -185,4 +186,78 @@ func TestEngineRunsOnSQLiteStore(t *testing.T) {
 	}
 }
 
+// TestEngineFailedResultWithCompletePatchesStaysFailedOnSQLiteStore：F05/U3B 的
+// 不变式在 SQLite-store 集成层同样成立——executor 报失败就是失败，patches
+// （交付物）齐全也不得把运行翻成 completed：文件只是诊断信息，不是权威结果。
+func TestEngineFailedResultWithCompletePatchesStaysFailedOnSQLiteStore(t *testing.T) {
+	runStore, err := OpenSQLiteStore(filepath.Join(t.TempDir(), "runs.db"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer runStore.Close()
+	dir := t.TempDir()
+	reg := squad.NewRoleRegistry()
+	if err := reg.Register(squad.RoleSpec{Role: "researcher", Backend: "script"}); err != nil {
+		t.Fatal(err)
+	}
+	backends := squad.NewBackendResolver()
+	// 失败结果但携带全套交付物：旧语义会把它提升为成功，U3B 起必须保持失败。
+	backends.RegisterInstance("script", stubExecutor{result: &squad.ExecResult{
+		Success: false, Logs: "stub-refused",
+		Patches: map[string][]byte{
+			"output.md":   []byte(goodReportLite),
+			"notes.md":    []byte(goodReportLite),
+			"fields.json": []byte("{}"),
+		},
+	}})
+	blueprints := squad.NewBlueprintRegistry()
+	if err := blueprints.Register(squad.Blueprint{
+		Key: "faildemo", Title: "失败演示", Match: []string{"失败演示"},
+		Steps: []squad.StepSpec{{ID: "s1", Role: "researcher", Title: "调研", Targets: []string{"output.md"}}},
+	}); err != nil {
+		t.Fatal(err)
+	}
+	eng, err := squad.NewEngine(squad.Options{
+		DataDir: dir, Registry: reg, Blueprints: blueprints,
+		Planner:  squad.NewRulePlanner(),
+		Backends: backends, Sink: squad.NopSink{},
+		Store: runStore,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	res, err := eng.Run(context.Background(), squad.Goal{Text: "做一个失败演示", HitlMode: squad.HitlAuto}, squad.RunOptions{})
+	if err != nil {
+		t.Fatalf("run: %v", err)
+	}
+	if res.Status == squad.RunCompleted {
+		t.Fatalf("failed executor result must not complete (patches are diagnostic only)")
+	}
+	if res.Status != squad.RunFailed {
+		t.Fatalf("status = %s, want failed", res.Status)
+	}
+	if res.Plan == nil || res.Plan.Steps[0].Status != "failed" {
+		t.Fatalf("s1 should be failed, plan = %+v", res.Plan)
+	}
+	if !strings.Contains(res.Error, "stub-refused") {
+		t.Fatalf("failure reason not preserved: %q", res.Error)
+	}
+	// 同一断言穿过 Store 端口：SQLite 里落盘的也是失败，而非 completed。
+	st, err := runStore.LoadRun(res.WorkDir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if st.Plan.Workflow.Status != "failed" {
+		t.Fatalf("persisted workflow status = %s, want failed", st.Plan.Workflow.Status)
+	}
+	if got := st.Plan.Workflow.Steps[0]; got.Status != "failed" || !strings.Contains(got.Error, "stub-refused") {
+		t.Fatalf("persisted step = %+v", got)
+	}
+	// patches 确已物化（文件齐全），依然不翻转状态：权威是执行结果，不是文件。
+	sub := filepath.FromSlash(st.Plan.Workflow.Steps[0].SubWorkspace)
+	if _, err := os.Stat(filepath.Join(res.WorkDir, sub, "output.md")); err != nil {
+		t.Fatalf("diagnostic patch should still be materialized: %v", err)
+	}
+}
+
 const goodReportLite = "# 测试交付物\n\n## 概述\n\n这是由脚本后端生成的合格交付物，长度超过五十个字符以满足最小质检要求。\n"