fix(3597): make windows test cleanup retry on EBUSY + drop CRLF-broken local parseFrontmatter

Two windows-only failure clusters surfaced when the chunking fix in
52f23ac0 made Windows tests actually run:

1) Cleanup EBUSY race. On Windows, fs.rmSync without {maxRetries,retryDelay}
   races against AV scanners / file-indexers / just-exited child processes
   that still hold handles when teardown fires. Surfaces as
       EBUSY: resource busy or locked, rmdir 'C:\Users\...\AppData\Local\Temp\gsd-...'
   in bug-1736, bug-2248, bug-2698, bug-2838, and every test routing through
   the shared tests/helpers.cjs cleanup() (≈170 consumers — bug-2774 et al).
   Fix: add {maxRetries: 10, retryDelay: 100} to the shared helper plus the
   four inline cleanup sites. On POSIX the retry loop is dead code (first
   try succeeds), so no impact on ubuntu/macos.

2) bug-2839 had a local parseFrontmatter that anchored on /^---\n/ — on a
   Windows checkout with autocrlf=true the file content is CRLF, the regex
   never matches, the function returns null, and the before() hook asserts
   "agent must have YAML frontmatter" → entire suite cancels. The shared
   tests/helpers.cjs parseFrontmatter is already CRLF-aware (split /\r?\n/);
   switch to it.

Validated: plex2 (ubuntu docker) 11224/0 pass post-patch.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/bug-1736-local-install-commands.test.cjs

@@ -46,7 +46,7 @@ describe('#1736: local Claude install populates .claude/commands/gsd/', () => {
   });
 
   afterEach(() => {
-    fs.rmSync(tmpDir, { recursive: true, force: true });
+    fs.rmSync(tmpDir, { recursive: true, force: true, maxRetries: 10, retryDelay: 100 });
   });
 
   test('local install creates .claude/commands/gsd/ directory', (t) => {

tests/bug-2248-local-install-statusline.test.cjs

@@ -47,7 +47,7 @@ describe('#2248: local Claude install does not clobber profile-level statusLine'
   });
 
   afterEach(() => {
-    fs.rmSync(tmpDir, { recursive: true, force: true });
+    fs.rmSync(tmpDir, { recursive: true, force: true, maxRetries: 10, retryDelay: 100 });
   });
 
   test('local install does not write statusLine to .claude/settings.json', (t) => {

tests/bug-2698-crlf-install.test.cjs

@@ -60,7 +60,7 @@ describe('#2698: CRLF stale gsd-update-check block is removed on Codex reinstall
   });
 
   afterEach(() => {
-    fs.rmSync(tmpDir, { recursive: true, force: true });
+    fs.rmSync(tmpDir, { recursive: true, force: true, maxRetries: 10, retryDelay: 100 });
   });
 
   // Helper: pre-populate .codex/config.toml with a GSD marker + stale hooks block

tests/bug-2838-summary-rescue-gitignored-planning.test.cjs

@@ -163,7 +163,7 @@ ${rescueBlock}
 }
 
 function cleanup(tmp) {
-  try { fs.rmSync(tmp, { recursive: true, force: true }); } catch (_) {}
+  try { fs.rmSync(tmp, { recursive: true, force: true, maxRetries: 10, retryDelay: 100 }); } catch (_) {}
 }
 
 describe('bug-2838: SUMMARY rescue handles gitignored .planning/', () => {

tests/bug-2839-review-fix-transactional-cleanup.test.cjs

@@ -30,19 +30,9 @@ const assert = require('node:assert/strict');
 const fs = require('fs');
 const path = require('path');
 
-const SENTINEL_NAME = '.review-fix-recovery-pending.json';
+const { parseFrontmatter } = require('./helpers.cjs');
 
-function parseFrontmatter(content) {
+const SENTINEL_NAME = '.review-fix-recovery-pending.json';
-  const match = content.match(/^---\n([\s\S]*?)\n---/);
-  if (!match) return null;
-  const body = match[1];
-  const out = {};
-  for (const line of body.split('\n')) {
-    const m = line.match(/^([a-zA-Z_]+):\s*(.*)$/);
-    if (m) out[m[1]] = m[2].trim();
-  }
-  return out;
-}
 
 function extractStep(content, stepName) {
   const re = new RegExp(`<step\\s+name="${stepName}">([\\s\\S]*?)</step>`);

tests/helpers.cjs

@@ -104,7 +104,10 @@ function createTempGitProject(prefix = 'gsd-test-') {
 }
 
 function cleanup(tmpDir) {
-  fs.rmSync(tmpDir, { recursive: true, force: true });
+  // maxRetries/retryDelay absorbs transient Windows EBUSY where AV scanners,
+  // file-indexers, or just-exited child processes still hold handles when
+  // teardown runs. On POSIX the retry loop is a no-op (rmSync succeeds first try).
+  fs.rmSync(tmpDir, { recursive: true, force: true, maxRetries: 10, retryDelay: 100 });
 }
 
 /**