Transcript glyph coverage PASS (linked CN + TW, matching line metrics)
{
  "source_elf": "/home/lighthouse/esp32-dev/firmware/build/device_lab.elf",
  "cn_bytes": 318199,
  "tw_bytes": 592105,
  "total_bytes": 910304,
  "matching_line_metrics": true,
  "corpus_characters": 64,
  "new_font_assets": 0,
  "physical_render_verified": false
}