memory-reflexion

Tier 2 episode extraction, the reflexion write path split out of the memory router per ADR-063. Extracts an episode from a completed session log so later sessions can replay what was tried and what it cost. Use when you say extract episode from session, record what happened this session, or re-extract this episode. Do NOT use for Tier 1 lookups (use memory-search) or for adding citations (use memory-enhancement).