- DisplayManager.defer_update()/process_deferred_updates(): one lock around
every queue mutation (appends from the update thread were lost to the
render thread's filter/slice reassignments); callables run outside it.
- FontManager and element_style no longer cache BDF freetype.Face objects
process-wide (load_bdf_face caches them per thread); element_style's LRU
is locked against get/move_to_end vs eviction races.
- limit_refresh_rate_hz default is one constant, DEFAULT_REFRESH_LIMIT_HZ =
100 (the template's), for the library options, refresh_hz, the matrix
guard, Vegas and scroll_config. Previously a missing key capped the panel
at 90 while pacing assumed 100.
- Sync follower: the TCP thread queues the leader's scroll image; the render
thread swaps image/array/width in between frames.
- update_display() error log rate-limited (traceback first, then once a
minute with a count); swallowed DisplayController exceptions log at DEBUG.
- Root display_controller.py runs run.py via runpy.
- stream_manager: correct the RLock release comments; merge duplicate if.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
