A stale tab or hand-crafted request posting event_id=0 to the surgical
delete route would compute after_event_id=-1 and silently truncate the
entire log. Now rejected with 400.
SQLite assigns event_log ids starting at 1, so any legitimate id is
always >= 1 — non-positive values can only indicate a client bug.
Test: tests/test_drawer_phase4.py::test_delete_turn_with_event_id_zero_returns_400.
Audit of chat/state/manual_edit.py target_kind dispatch found two §6.4
fields without drawer affordances despite being already-projected text
columns: chat_state.narrative_anchor and chat_state.weather. Both land
via new manual_edit branches (target_kind chat_narrative_anchor and
chat_weather) plus paired drawer routes and Scene-section text inputs.
The container properties_json blob is intentionally deferred — bounded
JSON edits aren't wired through manual_edit and the drawer never
surfaces multiple containers at once, so v1 leaves it out.
Joseph Doherty