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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>