d8cd7ac2e7
Companion to gateway-gateway#160 (connector absent-row default flips to mention-gated / requireAddress=true). relay_relevance_policy() previously returned None whenever the projected policy was all-falsy, on the premise that 'the connector's quiet default already matches'. Once the connector defaults requireAddress to true, that premise inverts for one case: an agent EXPLICITLY configured with require_mention: false would stay silent and get mention-gated anyway, with no way out. The nothing-to-declare check now keys on 'require_mention is unset' rather than 'require_mention is falsy': an explicit false IS a configured knob and is declared to the connector; a genuinely unconfigured platform still declares nothing and inherits the connector's default. No wire/contract change.