test(lbug): de-brittle the close/CHECKPOINT structural guard (#2264 review P2)

lbug-checkpoint.test.ts grepped the adapter SOURCE (comments included) for
conn.close()/db.close()/.query('CHECKPOINT') literals, coupling a passing test to
comment wording — a prior commit had to reword a comment just to keep it green.
Strip comments from the read source before the structural assertions so they
reflect code only; the invariant (exactly two CHECKPOINT sites; close calls only
in safeClose) is preserved and no longer breaks on a comment edit.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JBJomjoTdBV2eveDVq4JMm

gitnexus/test/unit/lbug-checkpoint.test.ts

@@ -23,10 +23,20 @@ import { flushWAL } from '../../src/core/lbug/lbug-adapter.js';
 describe('flushWAL / safeClose — consolidation guard (#1376)', () => {
   let adapterSource: string;
 
+  // Strip comments before the structural assertions so they reflect CODE only.
+  // Otherwise a `conn.close()` / `db.close()` / `.query('CHECKPOINT')` token
+  // mentioned in a doc comment would falsely trip (or vacuously satisfy) a guard,
+  // coupling the test to comment wording — exactly the brittleness flagged in the
+  // #2264 review (a prior commit had to reword a comment just to keep this green).
+  const codeOnly = (src: string): string =>
+    src.replace(/\/\*[\s\S]*?\*\//g, '').replace(/\/\/[^\n]*/g, '');
+
   beforeAll(async () => {
-    adapterSource = await fs.readFile(
-      path.join(__dirname, '..', '..', 'src', 'core', 'lbug', 'lbug-adapter.ts'),
-      'utf-8',
+    adapterSource = codeOnly(
+      await fs.readFile(
+        path.join(__dirname, '..', '..', 'src', 'core', 'lbug', 'lbug-adapter.ts'),
+        'utf-8',
+      ),
     );
   });