chore: sync carrot settings
docs: explain S3 H.264 installation and connection setup
docs: explain S3 RGB status LED and firmware 1.1.1
docs: use plain C4 python3 for S3 registration
docs: publish S3 hardware, firmware and setup guide
docs: explain S3 Wi-Fi HUD registration and JPEG policy
docs: explain navigation and lever options and RAV4 radar support
Explain braking distance memory and guarded comfort headway
Document CAN-FD zero-aReq stop trial without retry
Clarify one-time startup readiness for Always Lateral
Document lateral input readiness and startup steering protection
Document Toyota PCM speed and single acceleration compensation