Plan proposals live in the conversation (plan-approval flow); items are created open/unassigned and work starts at assignment — the granted, revocable authority.
Also closes a verify gap: tail truncation is now caught against the stored head hash.
Cases outlive boards/teams, so entries+per-case chains move to journal.db with a grant table (creator-on-attach, assignment-fed, explicit shares).
Adds the raw capture kind: excerpt inline under a body cap, full payload as a sha256-referenced artifact; reads skip raw unless asked.
One hash-chained append-only log; board, journal, and per-agent deliveries are projections (rebuild == replay).
Six board verbs + journal verbs with role authority; worker slice and case access ride assignment.