test: add regression test for complete-task normalizeListParam

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

src/resources/extensions/gsd/tests/complete-task-normalize-lists.test.ts

@@ -0,0 +1,54 @@
+/**
+ * Regression test for #3692 — normalizeListParam in complete-task
+ *
+ * Agents sometimes pass keyFiles/keyDecisions as comma-separated strings
+ * instead of arrays.  normalizeListParam coerces both forms to string[].
+ *
+ * Also verifies roadmap-slices.ts detects dependency column from header.
+ */
+
+import { describe, test } from 'node:test';
+import assert from 'node:assert/strict';
+import { readFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+const completeTaskSrc = readFileSync(
+  join(__dirname, '..', 'tools', 'complete-task.ts'),
+  'utf-8',
+);
+const roadmapSlicesSrc = readFileSync(
+  join(__dirname, '..', 'roadmap-slices.ts'),
+  'utf-8',
+);
+
+describe('complete-task normalizeListParam (#3692)', () => {
+  test('normalizeListParam function is defined', () => {
+    assert.match(completeTaskSrc, /function normalizeListParam\(/,
+      'normalizeListParam function should be defined in complete-task.ts');
+  });
+
+  test('normalizeListParam is applied to keyFiles', () => {
+    assert.match(completeTaskSrc, /normalizeListParam\(params\.keyFiles\)/,
+      'normalizeListParam should be applied to keyFiles');
+  });
+
+  test('normalizeListParam is applied to keyDecisions', () => {
+    assert.match(completeTaskSrc, /normalizeListParam\(params\.keyDecisions\)/,
+      'normalizeListParam should be applied to keyDecisions');
+  });
+});
+
+describe('roadmap-slices depColumnIndex detection (#3692)', () => {
+  test('depColumnIndex is detected from header row', () => {
+    assert.match(roadmapSlicesSrc, /depColumnIndex/,
+      'depColumnIndex variable should exist in roadmap-slices.ts');
+    assert.match(roadmapSlicesSrc, /headerCells/,
+      'headerCells should be parsed from the header row');
+    assert.match(roadmapSlicesSrc, /depends|deps|depend/i,
+      'header detection should match depends/deps/depend');
+  });
+});