pub fn warmup()Expand description
Force-init the embedded WubiDict and exercise common lookup paths so
the OS faults the FST’s .rodata pages into RAM and any internal fst::Map
streamer state is primed. Idempotent — relies on OnceLock::get_or_init
for the dict, and WubiDict::lookup for the page-touch effect. Called
from Session::warmup so a host can off-load the cold-path cost to a
background thread at startup instead of paying it on the user’s first
keystroke. ~100-300ms on iPhone cold; <1ms idempotent.