Module crash_log 

v1.4.110 P1-2: crash log + panic hook helpers

抽自 main.rs lines 20-123 (v1.4.97 P1-D-D 实装). Aligned with C++ NNCrashCenter pattern.

Functions

crash_log_dir 🔒

v1.4.97 P1-D-D: directory holding dated crash logs.

warn_if_previous_crash

v1.4.97 P1-D-D: at startup, scan crash dir for previous crashes, emit a WARN log with the latest filename so ops sees “daemon previously crashed at ” without manual file inspection. Best-effort, silent on errors.

write_crash_log_file

v1.4.97 P1-D-D: synchronously write a crash log file.