Implemented Behavior

• LuaJIT FFI haptics now probe /dev/input/event*, upload the rumble effect, and keep the first device that accepts EVIOCSFF.
• haptic_pulse() retries initialization if no active haptic device is ready.
• The Python haptic.py fallback uses the same dynamic device probing model.
• MPV return still closes and re-initializes haptics.

Acceptance Criteria

• L1/R1 on the main hub rotates the dial and produces a haptic pulse.
• Logs identify the selected haptic event node or report that no force-feedback device is available.
• No EmulationStation restart, reboot, or app kill is required.