docs: correct USB plan — all class drivers functional, 12+ quirks enforced
Corrected three outdated claims in the USB plan that resulted
from the original 2026-07-07 audit:
1. '3 class drivers are 32-line stubs' — WRONG.
redbear-acmd: 133 lines, CDC ACM serial (fully implemented)
redbear-ecmd: 261 lines, CDC ECM Ethernet (fully implemented)
redbear-usbaudiod: 308 lines, USB Audio (fully implemented)
2. 'xHCI quirks: 0' — WRONG. 12+ quirks enforced at runtime
(NO_64BIT_SUPPORT, ZERO_64B_REGS, BROKEN_STREAMS,
HW_LPM_DISABLE, LPM_SUPPORT, U2_DISABLE_WAKE, etc.)
3. 'Only ehcid implements UsbHostController' — WRONG. All 4 do.
Updated: P1-D section (3 empty stubs → RESOLVED), P6 status,
quirks count in status table.
vasilito
54aac15bae