Split real-world benchmark report modules

[yvette-carlisle]

Summary

• split closeout report assertions into report-family modules with shared helper boundaries
• split external adapter manifest assertions into adapter-family helper modules
• keep the parent benchmark modules as orchestration surfaces instead of large assertion monoliths

Validation

• RUSTC=/run/current-system/sw/bin/rustc cargo make fmt-rust
• RUSTC=/run/current-system/sw/bin/rustc cargo make check