Adds searchPipeline, which ranks candidates shallowly at no API cost, then
enriches a bounded subset (DEFAULT_ENRICH_LIMIT=25, DEFAULT_CONCURRENCY=8)
and re-ranks, taking max(shallow, deep) so a strong title match is never
diluted by unrelated deep content. Auth and rate-limit errors abort the
whole search via isFatalSearchError instead of degrading silently; other
enrichment failures degrade one record and are counted. A recency backfill
spends leftover enrichment budget on the most recently updated candidates
so a deep-only match is reachable at all. Adds the src/search/ barrel
export.
Reconciles the previously uncommitted pipeline.ts (written against an
earlier, defective version of this task's brief) with the corrected brief:
mapWithConcurrency's phase-2 callback is now given an explicit
EnrichedCandidate return type so its `deep: TDeep | undefined` field is a
single type rather than an inferred union, which is what the `entry is
Pair` narrowing predicate requires under TS2677.
Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
