Implements the firmware-disasm-confirmed Firestorm box protocol in the
MatrixPortal replica (ESC X outline / ESC x mode-fill via a BOXOP operand
collector, plus the ESC Y region op), updates FIRMWARE.md with the findings,
and adds FS-plasma-bench.ps1 -- a simulated MW4 serial stream for benching
the display without a pod.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
