Pre-flight review fixes: lazy import in md_translate to break the notion_writer<->md_translate cycle; clean columns state machine; markdown deletion hint in explain_api_error. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
9 TDD tasks: venv baseline, ntn_files (upload+preflight), image parsing, materialize walk, md_translate dialect translator, compat markdown helpers + version-aware client, CLI engine routing + two-phase image append, docs (v1.3.0), live smoke test. 55 unit tests across 4 suites. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
