P5 of the relay egress-authorization workstream. The relay path
authenticated the SENDER but never authorized the DESTINATION, and the
gateway compounded it from both ends.
(a) send_message could silently name an arbitrary relay target. Its
`target` parameter is free-form ('platform:chat_id'), so a model could
name ANY chat id and the gateway would emit an outbound frame for it.
gateway/relay/egress.py adds an attestation floor: a relay-routed
destination must have a provenance this gateway can show -- the
operator's home channel, the channel directory, or its own gateway
session origins. Anything else is refused HERE, with a visible tool
error naming the target, before a frame is written. Non-relay platforms
and platforms served by a live native adapter in this process are
untouched (same precedence resolve_delivery_transport applies).
(b) Connector declines were swallowed into apparent successes. The
connector's egress floor answers an unauthorized destination with a
DEFINITE failure whose text is deliberately uniform (F-005). Several
relay lanes degrade a *transport drop* by design and were degrading an
*authorization refusal* the same way:
- _send_media returned None, sending the caller into
BasePlatformAdapter's text fallback -- a DIFFERENT op re-addressed at
the very chat the connector had just refused.
- _send_prompt returned None, so exec-approval / slash-confirm /
clarify reported "relay prompt op unavailable" (a wrong reason) and
ran their numbered-text fallbacks into the refused chat.
- task_card_stop discarded the error entirely.
- typing / delete / react / thread ops degraded silently at debug.
is_egress_decline() classifies THAT a decline happened (never why --
the uniform text is not parsed for reasons) and requires a definite,
non-ambiguous failure, so a lost-ack retry is still a transport
outcome. Lanes with an error-carrying contract now report the decline
verbatim; cosmetic bool/None lanes still degrade but log it at WARNING.
Advisory progress drops that legitimately degrade are unchanged: the
task_card send lane, the draft ambiguous/except branches, and every
transport-exception path keep their existing fail-open behaviour.
Tests: 21 mutations of the production source, all KILLED.
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