test: add regression test for isClosedStatus dispatch guard

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/resources/extensions/gsd/tests/dispatch-guard-closed-status.test.ts

@@ -0,0 +1,33 @@
+/**
+ * dispatch-guard-closed-status.test.ts — #3653
+ *
+ * Verify that the dispatch guard uses isClosedStatus() instead of a raw
+ * `status === "complete"` check when determining whether a slice is done.
+ * Reconciled slices may carry statuses like "skipped" or "cancelled" which
+ * are also closed — the raw check caused false dispatch blocks.
+ */
+
+import { describe, test } from "node:test";
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+import { join, dirname } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const sourceFile = join(__dirname, "..", "dispatch-guard.ts");
+
+describe("dispatch-guard isClosedStatus migration (#3653)", () => {
+  const source = readFileSync(sourceFile, "utf-8");
+
+  test("imports isClosedStatus from status-guards", () => {
+    assert.match(source, /import\s*\{[^}]*isClosedStatus[^}]*\}\s*from\s*["']\.\/status-guards/);
+  });
+
+  test("uses isClosedStatus() for slice done check instead of raw comparison", () => {
+    assert.match(source, /done:\s*isClosedStatus\(r\.status\)/);
+  });
+
+  test("does not use raw status === 'complete' for DB slice rows", () => {
+    assert.doesNotMatch(source, /done:\s*r\.status\s*===\s*["']complete["']/);
+  });
+});