FontManager doesn't register tom_thumb even though assets/fonts/tom-thumb.bdf ships with the core

[ChuckBuilds]

Summary

assets/fonts/tom-thumb.bdf ships with the core, but FontManager's family table (src/font_manager.py:97-99) only registers three families:

"press_start": "assets/fonts/PressStart2P-Regular.ttf",
"four_by_six": "assets/fonts/4x6-font.ttf",
"five_by_seven": "assets/fonts/5x7.bdf"

Any plugin that asks for tom_thumb gets Font family 'tom_thumb' not found from the core and has to carry its own loader to use a font the core already ships.

Evidence

The countdown plugin (v3.3.0) offers all four families in its config_schema.json enum. Rendering with each:

cd ~/LEDMatrix
python3 scripts/check_plugin.py -p countdown -d ~/LEDMatrix/plugin-repos \
 --golden-dir /tmp/nogolden -o /tmp/cd_tom_thumb \
 -c '{"countdowns":[{"name":"Launch","target":"2027-01-01T00:00:00"}],"font_size":6,"fit_to_display":false,"font_family":"tom_thumb"}'

family	render rc	distinct output	"not found" warnings per run
press_start	0	yes	0
four_by_six	0	yes	0
five_by_seven	0	yes	0
tom_thumb	0	yes	16

All four produce visually distinct renders, so tom_thumb does end up applied — but only because countdown mirrors the core's table privately and loads the file itself (manager.py:291-297, _load_family_font_direct). The 16 warnings per render are the core refusing first.

The file is present:

$ ls ~/LEDMatrix/assets/fonts/ | grep tom
tom-thumb.bdf

Why it matters

1. Log noise: 16 warning lines per render for a font that works.
2. Any plugin without countdown's private fallback genuinely cannot use a bundled font.
3. countdown is carrying a duplicated copy of a core table specifically to work around this — the comment there ("Mirror of the core FontManager's family -> file table") reads as a known workaround.

Suggested fix

Add the entry to the core table:

"tom_thumb": "assets/fonts/tom-thumb.bdf",

Worth checking the other bundled .bdf files in assets/fonts/ at the same time — 4x6.bdf, 5x8.bdf, 6x10.bdf, MatrixChunky8.bdf, cozette.bdf and friends are all shipped but unnamed, while calendar's schema for instance exposes 5x7.bdf, 4x6.bdf and cozette.bdf by filename rather than family.

Environment

LEDMatrix v3.3.0-4-g0730d952, 256x64 rig, countdown 3.3.0.