Conflict in crates/fonts/src/lib.rs: both sides added tests at the same
place; all three are kept. #322 independently serialised font loading in
try_family (loaded_families). This branch's loading lock and batched
add_fonts stay for the system-fallback path, but load_family no longer
skips a family with some face loaded: a lookup by a Windows family name
loads only that style's file, and the family's other files must load
later (windows_family_names_find_their_faces).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>