v0.2.0

[0.2.0] - 2026-09-03

Added

• Side-agent model can be pinned via ~/.pi/agent/btw.json
  ({"model": "provider/modelId", "thinking": "low"}); a pinned model is
  never re-synced to the main session's. The file is re-read before every
  ask, invalid configs are reported instead of silently falling back, and
  the overlay title shows the model currently in use.

Fixed

• The sub-session now runs on in-memory settings: its model/thinking
  switches no longer leak into the user's global settings.json.