test: add regression test for query-tools ensureDbOpen usage

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

src/resources/extensions/gsd/tests/query-tools-db-open.test.ts

@@ -0,0 +1,47 @@
+/**
+ * Regression test for #3672 — query-tools uses ensureDbOpen
+ *
+ * gsd_milestone_status previously called isDbAvailable() but never
+ * ensureDbOpen(), making it always fail outside auto-mode sessions.
+ * The fix imports ensureDbOpen from dynamic-tools and calls it before
+ * querying the DB.
+ *
+ * This structural test verifies the ensureDbOpen import and usage exist
+ * in query-tools.ts.
+ */
+
+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 source = readFileSync(join(__dirname, '..', 'bootstrap', 'query-tools.ts'), 'utf-8');
+
+describe('query-tools ensureDbOpen usage (#3672)', () => {
+  test('imports ensureDbOpen from dynamic-tools', () => {
+    assert.match(source, /ensureDbOpen.*import\(|import.*ensureDbOpen/,
+      'query-tools should import ensureDbOpen');
+  });
+
+  test('calls ensureDbOpen() before DB queries', () => {
+    assert.match(source, /await ensureDbOpen\(\)/,
+      'query-tools should call await ensureDbOpen()');
+  });
+
+  test('no longer imports isDbAvailable in the execute path', () => {
+    // The old code imported isDbAvailable and checked it; the fix removed that
+    // The execute function should not destructure isDbAvailable from gsd-db
+    const executeBlock = source.slice(source.indexOf('async execute('));
+    assert.doesNotMatch(executeBlock, /isDbAvailable,/,
+      'execute path should not destructure isDbAvailable (replaced by ensureDbOpen)');
+  });
+
+  test('uses dbAvailable result from ensureDbOpen', () => {
+    assert.match(source, /dbAvailable\s*=\s*await ensureDbOpen\(\)/,
+      'should store ensureDbOpen result in dbAvailable');
+  });
+});