Add reconcile state planning core

internal/state/shared_root_test.go

@@ -132,6 +132,32 @@ func TestSharedRootOutputHelpers(t *testing.T) {
 	}
 }
 
+func TestRemoveMissingSharedRootOwnerOutputs(t *testing.T) {
+	state := validSharedRootState(t)
+	archive := CurrentOwnerScope("reports", "archive")
+	next, changed := RemoveMissingSharedRootOwnerOutputs(state, archive, []string{"report.md", "report.html"})
+	if !changed {
+		t.Fatal("RemoveMissingSharedRootOwnerOutputs() changed = false, want true")
+	}
+	if got, want := next.AllManagedOutputPaths(), []string{"report.html"}; strings.Join(got, ",") != strings.Join(want, ",") {
+		t.Fatalf("paths = %#v, want %#v", got, want)
+	}
+	if _, ok := next.OutputOwner("report.html"); !ok {
+		t.Fatal("report.html owner missing, want unrelated owner preserved")
+	}
+}
+
+func TestRemoveMissingSharedRootOutputs(t *testing.T) {
+	state := validSharedRootState(t)
+	next, changed := RemoveMissingSharedRootOutputs(state, []string{"report.md", "report.html"})
+	if !changed {
+		t.Fatal("RemoveMissingSharedRootOutputs() changed = false, want true")
+	}
+	if got := next.AllManagedOutputPaths(); len(got) != 0 {
+		t.Fatalf("paths = %#v, want none", got)
+	}
+}
+
 func TestSharedRootProjectAndMergeOwnerOutputs(t *testing.T) {
 	state := validSharedRootState(t)
 	archive := CurrentOwnerScope("reports", "archive")