fix(extraction): smooth heading-density score term with sqrt#86
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The 2026-07-06 oracle-gap diagnostic (notes/selector-oracle-gap- diagnostic.md) showed heading_score's linear density term with a 0.25 cap creates an all-or-nothing cliff that drives 57.7% of wrong candidate picks among selectable candidates. sqrt dampening (cap 0.35, weight 40) was the winning variant (V1) of a 4-variant offline matrix re-scored over all 1,497 WCXB pages: +0.005 full-set F1, +0.024 on the 487-page scoring-failure bucket, all 7 page types net-positive, only 43 cheap regressions (F1 -5.3 vs +12.9 gained). Combining with length-score dampening (V3) measured strictly worse than V1 alone. Gates: WCXB end-to-end 0.809 -> 0.814 (matches offline prediction); parity 14/14 develop-passing cases (hada_news fails identically on develop - live front-page drift); coding shard 24/24.
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Summary
One-line rescoring change in
_score_candidate: the heading-density term's linear ramp with a 0.25 cap created an all-or-nothing cliff that the 2026-07-06 oracle-gap diagnostic identified as the dominant cause (57.7%) of wrong candidate picks among selectable candidates. Replaced with sqrt dampening (cap 0.35, weight 40) — the winning variant (V1) of a 4-variant offline matrix re-scored over all 1,497 WCXB dev pages. Combining with length-score dampening (V3) measured strictly worse than V1 alone; a nav/link-density penalty (V4) was inert.Gates
hada_newsfails identically on develop — live front-page drift, pre-existingDiagnostic + variant matrix details:
notes/selector-oracle-gap-diagnostic.md(local). Remaining oracle gap (~53% of the original 0.068) is the records-sentinel forfeit gate — separate follow-up (Fix A), not touched here.🤖 Generated with Claude Code