fix: use correct project directory for Windows subagents (#1718)

src/shared/session-directory-resolver.ts

@@ -0,0 +1,39 @@
+const WINDOWS_APPDATA_SEGMENTS = ["\\appdata\\local\\", "\\appdata\\roaming\\", "\\appdata\\locallow\\"]
+
+function normalizeWindowsPath(directory: string): string {
+  return directory.replaceAll("/", "\\").toLowerCase()
+}
+
+export function isWindowsAppDataDirectory(directory: string): boolean {
+  const normalizedDirectory = normalizeWindowsPath(directory)
+  return WINDOWS_APPDATA_SEGMENTS.some((segment) => normalizedDirectory.includes(segment))
+}
+
+export function resolveSessionDirectory(options: {
+  parentDirectory: string | null | undefined
+  fallbackDirectory: string
+  platform?: NodeJS.Platform
+  currentWorkingDirectory?: string
+}): string {
+  const {
+    parentDirectory,
+    fallbackDirectory,
+    platform = process.platform,
+    currentWorkingDirectory = process.cwd(),
+  } = options
+
+  const sessionDirectory = parentDirectory ?? fallbackDirectory
+  if (platform !== "win32") {
+    return sessionDirectory
+  }
+
+  if (!isWindowsAppDataDirectory(sessionDirectory)) {
+    return sessionDirectory
+  }
+
+  if (isWindowsAppDataDirectory(currentWorkingDirectory)) {
+    return sessionDirectory
+  }
+
+  return currentWorkingDirectory
+}