The approved real test reply was sent and the thread updated (same
X-GM-THRID as the original). The live test exposed one bug: the thread
check hardcoded Gmail's sent mailbox as "[Gmail]/Sent Mail", but this
account exposes it as "[Google Mail]/Sent Mail".
- internal/mailfetch: LIST parser, ListMailboxes, and SentMailbox that
finds the mailbox flagged \Sent (RFC 6154) with name fallbacks.
- internal/mailops: VerifyThreadUpdated selects the discovered \Sent
mailbox instead of a hardcoded name.
- cmd/email-agent: -check-thread <id> exercises the check against real
Gmail without sending mail.
- Tests for LIST parsing, sent-mailbox discovery, and the discovery
error path.
- docs/phase5-replies.md: record send-as verification, the sent reply's
thread id, the app confirmation (sent_reply_in_thread=true), and the
fix.
Co-Authored-By: Paperclip <noreply@paperclip.ing>
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