When a resource is created with bot identity, the CLI attempts to
auto-grant full_access to the current user. If the user open_id is
missing or the grant API call fails, the result was only written to
the JSON permission_grant field and easily overlooked.
Changes:
- Add stderr warnings when auto-grant is skipped or fails
- Add 'hint' field to permission_grant JSON output with failure reason
and actionable next step (e.g. auth login, check scope, retry)
- Add end-to-end skipped/failed tests across all affected shortcuts
(doc, drive, sheets, slides, wiki, markdown, base)
Closes#963
