Doc-gap check (DOC-164 slice 7+)
Build or refresh the cross-sidecar doc-gap report at lineage/{repo}/doc-gaps.md. The doc-gap-finder reducer walks every per-node sidecar's docs_link_semantic block, re-WebFetches each claimed URL to verify status + anchor + content alignment, joins the concept catalog (concepts.yaml) against the live documentation/docs/SUMMARY.md to surface concept-without-page gaps, runs the Type-5 bidirectional drift probe per `adrs/drafts/research/agentic-code-ontol
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