Tier 1: local  images uploaded via `ntn files create` and
embedded as file_upload image blocks (parser stays pure; upload happens
in an isolated post-parse walk).
Tier 2: opt-in `--engine markdown` writes through Notion's native
enhanced-markdown endpoints (POST /pages, PATCH .../markdown) with a
dialect translator (callouts/columns/toggles/mentions) so one source
doc works in both engines. Default engine stays `blocks` (no regression).
Adds ntn_files.py + md_translate.py, version-aware client (2026-03-11
for markdown writes only), new test suites, venv setup, docs → v1.3.0.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Andrew Yim
aa003e28cc