Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

src/resource-loader.ts

@@ -1,6 +1,6 @@
 import { DefaultResourceLoader } from '@gsd/pi-coding-agent'
 import { homedir } from 'node:os'
-import { chmodSync, cpSync, existsSync, mkdirSync, readFileSync, readdirSync, rmSync, writeFileSync } from 'node:fs'
+import { chmodSync, cpSync, existsSync, mkdirSync, readFileSync, readdirSync, rmSync, statSync, writeFileSync } from 'node:fs'
 import { dirname, join, relative, resolve } from 'node:path'
 import { fileURLToPath } from 'node:url'
 import { compareSemver } from './update-check.js'
@@ -139,16 +139,32 @@ export function getNewerManagedResourceVersion(agentDir: string, currentVersion:
  * Files copied from the Nix store inherit read-only modes (0444/0555).
  * Calling this before cpSync prevents overwrite failures on subsequent upgrades,
  * and calling it after ensures the next run can overwrite the copies too.
+ *
+ * Preserves existing permission bits (including executability) and only adds
+ * owner-write (and for directories, owner-exec) without widening group/other
+ * permissions.
  */
 function makeTreeWritable(dirPath: string): void {
   if (!existsSync(dirPath)) return
-  chmodSync(dirPath, 0o755)
-  for (const entry of readdirSync(dirPath, { withFileTypes: true })) {
-    const entryPath = join(dirPath, entry.name)
-    if (entry.isDirectory()) {
+
+  const stats = statSync(dirPath)
+  const isDir = stats.isDirectory()
+  const currentMode = stats.mode & 0o777
+
+  // Ensure owner-write; for directories also ensure owner-exec so they remain traversable.
+  let newMode = currentMode | 0o200
+  if (isDir) {
+    newMode |= 0o100
+  }
+
+  if (newMode !== currentMode) {
+    chmodSync(dirPath, newMode)
+  }
+
+  if (isDir) {
+    for (const entry of readdirSync(dirPath, { withFileTypes: true })) {
+      const entryPath = join(dirPath, entry.name)
       makeTreeWritable(entryPath)
-    } else {
-      chmodSync(entryPath, 0o644)
     }
   }
 }