0.19.0 — memory you can aim: thematic, time-windowed, from any history

• Standing memory from a web history: chf conversations.json --brief -o brief.md distills EVERY conversation of a claude.ai or
  ChatGPT data export into one cited brief (--llm included — notes
  cached per conversation). Explicit -o only: an export brief never
  touches the project store. --grep / --keep / --exclude compose
  in-memory.

• Thematic memory — --brief --grep X: distill only the sessions
  whose conversation mentions X (AND across repeated flags, said text
  only). An export by design: it requires -o and never overwrites or
  grafts from the project's standing brief.

• Time windows — --keep since:7d: alongside the count windows,
  keep sessions by last activity (7d/2h relative to now, or an ISO
  date), combinable as first:2,since:30d — sticky like the rest, so
  the time window slides on every refresh.

• --brief -o clipboard: ships the current brief — grafted
  distillation included, like the default destination — straight to the
  clipboard: one paste hands your project memory to any other model.
  Previously this wrote a literal file named clipboard.

• --brief --format json fails loudly instead of silently ignoring
  the flag.