- board: detect cuaU* serial ports in fallback scanner, filter .init/.lock nodes
- board: fall through to OS scan when arduino-cli returns empty (serial-discovery
uses unsupported Linux syscalls on FreeBSD)
- board: recognize cuaU* port names as USB in is_usb()
- upload.sh: fix silent exit under set -euo pipefail when vid_pid grep finds
nothing (|| true on LOCAL_PORT and LOCAL_VID_PID greps)
- upload.sh: add cuaU to auto-detect port pattern
- doctor: detect dialer and operator group membership, offer --fix for both
- doctor: detect avr-size installed but not on PATH, offer --fix to add to
shell rc file via detect_shell_rc()
- doctor: context-aware hardware section (suppress misleading messages when
groups not yet applied)
- doctor: FreeBSD-specific troubleshooting hints throughout
- devices: suppress arduino-cli board detection section on FreeBSD (broken
due to serial-discovery syscall issues)
- devices: always show USB hub tip on FreeBSD
- devices: FreeBSD-specific troubleshooting checklist with sequential numbering
on all platforms
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