Split large acceptance and benchmark test modules

[yvette-carlisle]

Summary

• split chunk search acceptance tests into helper and core modules while preserving filter, payload, and relation submodules
• split consolidation acceptance tests by apply, correction, review, and shared fixture responsibilities
• split the real-world consolidation knowledge benchmark tests into capture, live, fixture, and helper modules

Validation

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

Batch size: 16 files changed, 2252 insertions, 2118 deletions.