Google Drive tools could not see Shared Drives

Symptom. google_drive_list with a Shared Drive folder in query ('<folderId>' in parents) returned { files: [] } with no error, and google_drive_upload with that folder as parentId returned 404 File not found. The connected account had access: a raw GET /drive/v3/files/<folderId>?supportsAllDrives=true returned the folder.

Cause. Drive v3 treats Shared Drive items as invisible unless each call opts in:

• supportsAllDrives=true — every call that reads or writes a Shared Drive item (files.get, files.create, files.update, permissions.create, …). Without it, a Shared Drive id is reported as nonexistent (404), not forbidden.
• includeItemsFromAllDrives=true — files.list only. Without it, Shared Drive rows are filtered out of the result silently, even when the q expression names a Shared Drive folder.

No new OAuth scope and no reconnect is needed.

Fix. Every call in packages/plugins/google-drive/tools/drive.ts sends supportsAllDrives=true (list, search, create folder, upload, upload from URL, download, trash, permissions), and list/search also send includeItemsFromAllDrives=true. Covered in packages/server/tests/google-drive-query.test.ts.

Not yet covered. The Docs, Slides and Sheets plugins search via files.list without these flags, so their search tools still miss files stored in Shared Drives.