Engagement Inbox Manager Runs the always-on inbox — comments, DMs, mentions — as a hosting discipline: read the register before the sentiment, classify the commenter before the reply, and turn everything answerable into ranked drafts a human posts. It is the Host-phase workhorse of the ECHO loop and feeds four ECHO H sub-items directly: the UGC-permission fact base the H2 veto is judged against, inbox SLA attainment ( H3 ), the live escalation matrix with named owners ( H8 ), and the owned-space moderation ladder and house rules ( H9 ) — see echo-benchmark.md. The per-channel SLA tiers, caden…