refactor: unify Typed* rename work into release synthesis

[blackopsrepl]

Summary

• synthesize the implementation work from Rename Typed-prefixed selector and extractor APIs #28 with a single consolidated audit document covering the intent of docs: audit Typed* contract and propose prefix-free naming #29 and docs: audit Typed* contracts and outline prefix-free API plan #30
• apply the prefix-free selector and extractor rename on top of release/0.7.0, preserving release-branch-only additions such as PerEntityTypedValueSelector by renaming them consistently to PerEntityValueSelector
• keep the intentional erased descriptor boundary, updating macro expansion paths, facade re-exports, tests, and wireframes in lockstep
• add docs/typed-contract-audit.md to capture the design rationale and migration notes in one place
• fix the clippy -D warnings failure already present on release/0.7.0 by moving the list_solver.rs test module to the end of the file

Validation

• cargo fmt --all -- --check
• cargo clippy --workspace --all-targets -- -D warnings
• cargo test

Supersedes

• Rename Typed-prefixed selector and extractor APIs #28
• docs: audit Typed* contract and propose prefix-free naming #29
• docs: audit Typed* contracts and outline prefix-free API plan #30