When the hwdef explicitly sets `env TOOLCHAIN native`, board_list.py
correctly converts the toolchain to None. But when SITL boards fall
through to the default toolchain assignment, the string 'native' was
used without conversion. This caused size_compare_branches.py to try
running 'native-strip' (which doesn't exist) instead of plain 'strip'
when comparing SITL ELFs, resulting in a silently-caught
FileNotFoundError and empty output.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Peter BarkerandClaude Opus 4.6
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