Root cause: Assert-Step 'Final' 'dotnet/python/msbuild' block contains a
registry PATH refresh that overwrites $env:PATH, discarding the temporary
session injection added in §6.6. Next assertion (7z command available) then fails.
Fix: use SetEnvironmentVariable('PATH', ..., 'Machine') to permanently register
C:\Program Files\7-Zip in the system PATH — same pattern used for dotnet and MSBuild.
Follow-up registry refresh ensures $env:PATH is also current.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Simone
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