Records the departures: step 4 (the two attention items) deferred until U0b (R-F forbids them before it); the Lean step that AGENTS.md's bar requires over the unit's "no Lean change"; the recipients parameter renamed for the path-name lint; the note checked for a full TIN; schema 16 taken at merge (S4.3 had not landed); and the handbook section created before S4.5.