v0.2.0

chore(ext): release 0.2.0 — WebSocket transport

Minor bump for the first non-HTTP source mechanism. Ships:
- WebSocket transport (makePageWs + api.ws): Trade Republic's transaction timeline,
  run in the site tab so the session cookie rides the socket; per-item detail (ISIN,
  quantity × price) via a second subscription phase.
- Trade Republic monthly account statements (PDF) + transactions CSV (async export job).
- api.pdf.job (POST → poll status → download) and synthetic 'months' carrying per-month
  from/to bounds.
- Synthetic documents no longer marked as existing in 'All documents' until delivered.