Parent: #19094
Related: #18676
Summary
Add exact rerank from authoritative base-table vectors.
Scope
- fetch exact vectors from the base table
- rerank shortlisted candidates
- define final result correctness semantics
Acceptance Criteria
- exact rerank is isolated from approximate candidate generation
- final top-K semantics are explicit
- exact rerank behavior is covered by tests
Parent: #19094
Related: #18676
Summary
Add exact rerank from authoritative base-table vectors.
Scope
Acceptance Criteria