Research brief

Status: complete; published 2026-08-19

Scope as inventoried (v0 held). Layer questions answered: semantic-layer posture (H20 refined), retrieval substrate (H21 supported), mesh posture (CD-10), freshness (CD-12), ACL-aware retrieval mechanics. Maintainer POV: Batch A kickoff questions 3-4 (2026-08-19).

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Source: research/R02-data-platform/brief.md in the evidence repository behind this site.