readmit 1.1.0

• Canonical production now rejects discharge episodes with
  discharge_time > as_of_time before eligibility, risk-provider calls, or
  history writes. A discharge exactly at as_of_time remains valid.
• Canonical terminal events now require only terminal_event_id, episode_id,
  event_type, and occurred_at. Additional columns remain permitted.
  Eligibility uses occurred_at <= as_of_time; an event-availability timestamp
  is no longer required or interpreted.
• Newly initialized assessment history and rrp_inspect_history() retain
  selected terminal-event identity, type, and occurrence time without
  terminal_available_at.