simplify: query* (5 passes)

[ScriptedAlchemy]

Summary

• Five behavior-preserving simplification passes over tracedecay-query, tracedecay-temporal-query, and tracedecay-search-eval.
• Shared lexical row scoring, candidate binding, and byte n-gram packing. Ranking cap/score plumbing and worst-first heap keys collapsed to one implementation. Controlled cursor/composer parse batches share one digest loop.
• Net 7 files, +425 / -663.

Motivation

The two lexical projections (in-memory search-eval adapter and the artifact reader) and the temporal ranker had copied score and identity plumbing. Dead duplication, not a behavior change.

Passes

1. simplify(pass-1/5): share lexical row scoring — one score_lexical_row for whole-term, fuzzy, phrase, proximity, and echo penalty. Callers only supply term frequency and BM25 inputs. Dropped the artifact scorer's never-failing Result.
2. simplify(pass-2/5): share lexical candidate binding — one lexical_lane_candidate / lexical_lane_binding for projected chunks and artifact rows.
3. simplify(pass-3/5): share byte n-gram packing — one pack_byte_ngram and packed_query_ngrams for the artifact builder and the in-memory postings.
4. simplify(pass-4/5): collapse ranking score plumbing — diversity caps walk one counter array, missing metadata fills through one helper, tier scores use min.
5. simplify(pass-5/5): share digests and rank keys — cursor and composer parse batches share the digest loop; lexical and exact winner heaps share a key-only Keyed order.

Changes

• crates/tracedecay-query/src/retrieval/lexical/projection.rs and the in-memory / artifact readers and postings.
• crates/tracedecay-temporal-query/src/ranking.rs
• crates/tracedecay-search-eval/src/controlled_workloads.rs

Test plan

• cargo test -p tracedecay-query --features search-eval --lib retrieval::lexical:: — 117 passed, 0 failed, 1 ignored
• cargo test -p tracedecay-temporal-query --lib ranking:: — 16 passed, including diversity caps and bounded scores
• cargo test -p tracedecay-search-eval --lib controlled_workloads:: — 7 passed, 1 ignored
• cargo check for tracedecay-query (search-eval + tests), tracedecay-temporal-query, and tracedecay-search-eval
• cargo nextest run --workspace --no-fail-fast not run
• cargo clippy not run

Checklist

• CHANGELOG.md updated — not a user-facing contract change
• No secrets, credentials, or .env files included
• No breaking changes

  

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