feat(google-workspace): Drive write ops + Docs/Sheets create/append (#21895)

Expand the google-workspace skill beyond read-only access to Drive and
Docs. Sheets already had full scope — just adds the missing create verb.

New subcommands:
- drive get        : metadata for a single file
- drive upload     : upload a local file (auto MIME detection)
- drive download   : download or export (Docs/Sheets/Slides export to pdf/csv/pdf by default)
- drive create-folder
- drive share      : user/group/domain/anyone + reader/writer/etc.
- drive delete     : default trashes (reversible); --permanent skips the trash
- sheets create    : new spreadsheet with optional first-tab name
- docs create      : new doc, optional initial body
- docs append      : append text at end of an existing doc

Scope changes:
- drive.readonly     -> drive
- documents.readonly -> documents

Existing users with old tokens will hit the existing partial-scope
warning path (AUTHENTICATED (partial) ...) — the troubleshooting table
now points them at $GSETUP --revoke + redo steps 3-5 to pick up the
write scopes.

skills/productivity/google-workspace/scripts/setup.py

@@ -47,10 +47,10 @@ SCOPES = [
     "https://www.googleapis.com/auth/gmail.send",
     "https://www.googleapis.com/auth/gmail.modify",
     "https://www.googleapis.com/auth/calendar",
-    "https://www.googleapis.com/auth/drive.readonly",
+    "https://www.googleapis.com/auth/drive",
     "https://www.googleapis.com/auth/contacts.readonly",
     "https://www.googleapis.com/auth/spreadsheets",
-    "https://www.googleapis.com/auth/documents.readonly",
+    "https://www.googleapis.com/auth/documents",
 ]
 
 REQUIRED_PACKAGES = ["google-api-python-client", "google-auth-oauthlib", "google-auth-httplib2"]