gmail_last5

When the user runs /skill gmail_last5, do this:

1. Run a gog gmail search for the inbox, max 5 newest.
2. Parse the JSON results.
3. Reply with a concise list: sender + subject + date (if present).

Use this command (account may be omitted if default is configured; prefer explicit):

gog gmail search "in:inbox" --max 5 --json --results-only --account william.kettle@neuralshift.co.uk

If the command fails, ask the user to confirm which Gmail account is authenticated in gog.