set_llm_config only mutated an in-memory Mutex; lib.rs always started
from LlmConfig::default(). Config now round-trips through the same
dm-pal-prefs.json store as dataDir, with a defaults fallback so a
future shape change can't brick startup. Prefs consts now live in
lib.rs (pub) instead of being mirrored per-module.
itsamejms
03a634fdd0