- index each compression-dropped turn once: messages and context share
  objects, and earlier drops stay in the display history
- label raw excerpts against facts even when recall asks for scope=raw
- top up short vector results from the lexical index (NULL embeddings)
- count whole content words only and cap query terms at 12
- carry source_session_id on fact hits
- cap injected_chunk_ids at 100 entries
- keep a session delete successful when chunk cleanup fails
- stop logging query text in the memory paths
- stop fabricating similarity scores for recent chunks
- consult session_messages_archive in latest_summary_at