v0.5.4

[0.5.4] - 2026-09-03

Fixed

• Background failures escaping keyboard coroutines no longer crash the IME process. An uncaught
  exception handler on the service scope and process finalizer scope logs the stack trace while
  keeping the keyboard active under host applications.
• Learned-data persistence tickets are released when an asynchronous save or delete fails, so a
  transient I/O error no longer permanently deadlocks future user dictionary and touch model saves.

Changed

• Consolidated atomic file replacement and streaming SHA-256 verification into shared :core
  utilities.