Batch Rust module split refactor

[yvette-carlisle]

Summary

• Split rerank provider implementation into focused local/noise/response/test modules behind the existing facade.
• Split real_world_live_adapter ELF runtime, domain materializers, knowledge adapter, and QMD runtime into normal Rust modules with explicit visibility boundaries.
• Split the docs extension acceptance lifecycle tests into a dedicated child module while keeping shared fixtures in the parent.

Validation

• RUSTC=/run/current-system/sw/bin/rustc cargo make fmt-rust && RUSTC=/run/current-system/sw/bin/rustc cargo make check
• Final segment result: 403 tests run: 403 passed, 92 skipped
• git diff --check origin/main...HEAD

Batch Size

• 23 files changed, 1780 insertions(+), 1647 deletions(-)