- inter-session-messaging v2.0.0: channel switched from file inbox
(.agents/inbox/) to Mappa inbox.send/inbox.monitor/entity_get; letters are
entities i:N, delivery is a lease carve-out; address book + project-exists
check via admin_status; replies via entity_get(id).meta.from; subject
carries [event: ...] instead of frontmatter.
- session-inbox-monitor v1.0.0: monitor now polls GET /inbox?project=<cwd>
(HTTP, dedup by letter id, no .read/ move); hook inbox-monitor.ps1 rewritten
to inject the mappa poll command (sweep sentinel + project dir).
- delegate-task v0.5.1: covering letter goes through inbox_send, not file path.
Part of #983 (mappa-skills).
