A durable consumer on portal's WORMHOLE stream, each message handed to
the host's SMTP as text with an HTML alternative; acked on acceptance,
retried after a minute otherwise, left for a newer gdo when the
contract version is unknown. `gdo probe <to>` sends one through and
waits for the consumer to drain. GDO_TYPST_THEME attaches a Typst PDF.
A systemd unit and an installer for one gdo per host.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01L4jrCgLiKKHAEFuZUJjckH
