Verified on the Orin. A Shikoku extract yields only admin_level=4 prefecture
rows with no country record, and drive_on_right=1 on every one, so tiles built
against it route as right-hand traffic. The full Japan extract yields the
JP country row with drive_on_right=0.
The failure is silent, so every build now verifies the country row before
tiles are considered usable.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013kj58Jugkic783b8ZrtTVZ