fix(bmad-module): prevent atomicSwapDir data loss + harden ide-sync/wds cleanup paths

- atomicSwapDir: back the existing target up to a sibling before swapping the
  staged dir in, and roll back on a failed rename so an interrupted update can
  no longer leave neither the old nor the new install.
- ide-sync cleanup: only remove _bmad/ skill source dirs when EVERY IDE synced
  successfully (so failed targets remain retryable), and containment-check each
  CSV-derived path before fs.remove so a malformed row can't escape _bmad/.
- module-dirs: validate untrusted wds_folders entries for traversal/absolute
  escape before mkdir.
- Regenerate the vendored ide-sync bundle (vendor:check clean).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/core-skills/bmad-module/scripts/lib/fs-safe.mjs

@@ -99,7 +99,9 @@ export async function stageCopyPlan(srcRoot, destDir, plan, extras = {}) {
 export async function atomicSwapDir(stagedDir, targetDir) {
   const parent = path.dirname(targetDir);
   await fsp.mkdir(parent, { recursive: true });
-  const sibling = path.join(parent, `.${path.basename(targetDir)}.bmad-tmp-${crypto.randomBytes(6).toString('hex')}`);
+  const suffix = crypto.randomBytes(6).toString('hex');
+  const sibling = path.join(parent, `.${path.basename(targetDir)}.bmad-tmp-${suffix}`);
+  const backup = path.join(parent, `.${path.basename(targetDir)}.bmad-old-${suffix}`);
   try {
     try {
       await fsp.rename(stagedDir, sibling);
@@ -108,10 +110,23 @@ export async function atomicSwapDir(stagedDir, targetDir) {
       await copyDir(stagedDir, sibling);
       await fsp.rm(stagedDir, { recursive: true, force: true });
     }
-    await fsp.rm(targetDir, { recursive: true, force: true });
+    // Move any existing target aside as a backup rather than deleting it
+    // up front, so a failed swap can be rolled back to the old install.
+    const hadTarget = await fsp
+      .stat(targetDir)
+      .then(() => true)
+      .catch(() => false);
+    if (hadTarget) await fsp.rename(targetDir, backup);
+    try {
       await fsp.rename(sibling, targetDir);
+    } catch (e) {
+      if (hadTarget) await fsp.rename(backup, targetDir).catch(() => {});
+      throw e;
+    }
+    if (hadTarget) await fsp.rm(backup, { recursive: true, force: true });
   } catch (e) {
     await fsp.rm(sibling, { recursive: true, force: true });
+    await fsp.rm(backup, { recursive: true, force: true });
     throw e;
   }
 }

src/core-skills/bmad-module/scripts/lib/module-dirs.mjs

@@ -108,7 +108,14 @@ export async function createModuleDirectories(bmadDir, code, moduleConfig = {},
     // WDS subfolders under design_artifacts.
     if (configKey === 'design_artifacts' && wdsFolders.length) {
       for (const sub of wdsFolders) {
-        const subPath = path.join(fullPath, sub);
+        if (typeof sub !== 'string' || sub === '') continue;
+        const subPath = path.normalize(path.join(fullPath, sub));
+        // `sub` is untrusted module content; reject traversal/absolute escapes
+        // out of the design_artifacts directory.
+        if (subPath !== normalizedNewAbs && !subPath.startsWith(normalizedNewAbs + path.sep)) {
+          warn(`wds_folders entry escapes design_artifacts, skipping: ${sub}`);
+          continue;
+        }
         if (!(await pathExists(subPath))) {
           await fs.mkdir(subPath, { recursive: true });
           createdWdsFolders.push(sub);

src/core-skills/bmad-module/scripts/lib/vendor/ide-sync.mjs

@@ -10233,7 +10233,8 @@ var require_ide_sync = __commonJS({
         verbose,
         silent
       });
-      if (cleanup) await cleanupBmadSkillDirs(bmadDir);
+      const allSucceeded = results.every((r) => r && r.success);
+      if (cleanup && allSucceeded) await cleanupBmadSkillDirs(bmadDir);
       return { skipped: false, results };
     }
     async function cleanupBmadSkillDirs(bmadDir) {
@@ -10244,10 +10245,14 @@ var require_ide_sync = __commonJS({
       const records = csv.parse(csvContent, { columns: true, skip_empty_lines: true });
       const bmadFolderName = path.basename(bmadDir);
       const bmadPrefix = bmadFolderName + "/";
+      const bmadRoot = path.resolve(bmadDir);
       for (const record of records) {
         if (!record.path) continue;
         const relativePath = record.path.startsWith(bmadPrefix) ? record.path.slice(bmadPrefix.length) : record.path;
-        const sourceDir = path.dirname(path.join(bmadDir, relativePath));
+        const skillFilePath = path.resolve(bmadDir, relativePath);
+        if (skillFilePath !== bmadRoot && !skillFilePath.startsWith(bmadRoot + path.sep)) continue;
+        const sourceDir = path.dirname(skillFilePath);
+        if (sourceDir === bmadRoot) continue;
         if (await fs.pathExists(sourceDir)) {
           await fs.remove(sourceDir);
           await removeEmptyParents(path.dirname(sourceDir), bmadDir);

tools/installer/core/ide-sync.js

@@ -54,8 +54,11 @@ async function syncIdes({ projectRoot, bmadDir, ides, previousSkillIds = [], ver
   });
 
   // Mirror Installer._cleanupSkillDirs: skills are self-contained in IDE dirs,
-  // so _bmad/ only needs module-level files.
-  if (cleanup) await cleanupBmadSkillDirs(bmadDir);
+  // so _bmad/ only needs module-level files. Only clean up when every IDE
+  // synced successfully — otherwise the source skill dirs are still needed to
+  // retry the failed targets.
+  const allSucceeded = results.every((r) => r && r.success);
+  if (cleanup && allSucceeded) await cleanupBmadSkillDirs(bmadDir);
 
   return { skipped: false, results };
 }
@@ -77,10 +80,16 @@ async function cleanupBmadSkillDirs(bmadDir) {
   const bmadFolderName = path.basename(bmadDir);
   const bmadPrefix = bmadFolderName + '/';
 
+  const bmadRoot = path.resolve(bmadDir);
   for (const record of records) {
     if (!record.path) continue;
     const relativePath = record.path.startsWith(bmadPrefix) ? record.path.slice(bmadPrefix.length) : record.path;
-    const sourceDir = path.dirname(path.join(bmadDir, relativePath));
+    const skillFilePath = path.resolve(bmadDir, relativePath);
+    // Containment guard: a malformed CSV row (absolute path or `../`) must not
+    // let cleanup escape _bmad/ and remove arbitrary directories.
+    if (skillFilePath !== bmadRoot && !skillFilePath.startsWith(bmadRoot + path.sep)) continue;
+    const sourceDir = path.dirname(skillFilePath);
+    if (sourceDir === bmadRoot) continue;
     if (await fs.pathExists(sourceDir)) {
       await fs.remove(sourceDir);
       await removeEmptyParents(path.dirname(sourceDir), bmadDir);