Implement single-owner managed takeover

internal/app/run_test.go

@@ -592,8 +592,8 @@ func TestRunFixedPathDryRunWarnsForReplacement(t *testing.T) {
 	}
 	output := stdout.String()
 	for _, want := range []string{
-		"Warning: pipeline=reports destination=archive path_mapping=fixed action=replace_older replaces destination root for selected_bundle=new",
-		"bundle=new destination=archive backend=local path_mapping=fixed target=. action=replace_older",
+		"Warning: pipeline=reports destination=archive path_mapping=fixed action=replace_takeover replaces destination root for selected_bundle=new",
+		"bundle=new destination=archive backend=local path_mapping=fixed target=. action=replace_takeover",
 	} {
 		if !strings.Contains(output, want) {
 			t.Fatalf("stdout = %q, want substring %q", output, want)
@@ -642,7 +642,7 @@ func TestRunFixedPathSkipsWhenDestinationStateIsNewer(t *testing.T) {
 	sourceRoot := t.TempDir()
 	destinationRoot := t.TempDir()
 	newer := testutil.ValidManifest(testutil.BundleOptions{
-		ID:      "reports.newer",
+		ID:      "reports.same",
 		Created: testutil.DefaultCreated.Add(time.Hour),
 	})
 	writeDestinationState(t, destinationRoot, "", newer)
@@ -650,7 +650,7 @@ func TestRunFixedPathSkipsWhenDestinationStateIsNewer(t *testing.T) {
 		t.Fatalf("write existing report: %v", err)
 	}
 	writeSourceBundle(t, sourceRoot, "older", testBundleOptions{
-		ID:      "reports.older",
+		ID:      "reports.same",
 		Created: testutil.DefaultCreated,
 	})
 
@@ -1526,14 +1526,27 @@ func TestRunSkipsNewerDestination(t *testing.T) {
 	testutil.AssertFile(t, filepath.Join(destinationRoot, "report.md"), "newer\n")
 }
 
-func TestRunFailsOnConflict(t *testing.T) {
+func TestRunTakeoverNeverFailsOnConflict(t *testing.T) {
 	sourceRoot := t.TempDir()
 	destinationRoot := t.TempDir()
 	manifest := writeSourceBundle(t, sourceRoot, "", testBundleOptions{})
 	manifest.ID = "other.source"
 	writeDestinationState(t, destinationRoot, "", manifest)
+	configPath := writeConfigFile(t, `
+pipelines:
+  - id: reports
+    source:
+      backend: local
+      path: `+sourceRoot+`
+    destinations:
+      - id: archive
+        backend: local
+        path: `+destinationRoot+`
+        takeover:
+          mode: never
+`)
 
-	err := Run(context.Background(), RunOptions{ConfigPath: writeLocalConfig(t, sourceRoot, destinationRoot)})
+	err := Run(context.Background(), RunOptions{ConfigPath: configPath})
 	if err == nil || !strings.Contains(err.Error(), "fail_conflict") {
 		t.Fatalf("Run() error = %v, want fail_conflict", err)
 	}