Redacted excerpt; full evidence withheld.

$ pwd; git status --short --branch; rg --files -g 'README*' -g 'pyproject.toml' -g 'package.json' -g 'requirements*.txt' -g 'Makefile' -g 'AGENTS.md' -g '.github/**' | head -80; python3 --version; sed -n '1,240p' README.md
exit: 0
nd no unrelated file is read. A
successful synthetic review does not establish independent beta evidence,
security certification or release permission. See the
[fixture-only contributor guide](.github/FIXTURE_ONLY_CONTRIBUTIONS.md).

## Challenge synthetic policy results with negative controls (M9-F)

Run a zero-argument source-only mutation sensitivity check from a reviewed
checkout:

[excerpt truncated]