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- Supersede docs/design/2026-06-06-per-type-surfaces.md (banner added there); harvest validation seam, malformed-metadata flag, unknown-fields-ride-along, engine-unchanged invariant, N=1 document backcompat - bdd coverage kept as a future per-type surface over a generic `ref` field - Schema model = pure collection-config (not type-driven) - SLICE-0 added: amend binding SPEC.md §22.4a (frontmatter→sidecar, type-driven→collection-configured, defer surfaces) - Split personas: §6 Business Actors/Roles (solution-agnostic) + §10 Product Personas (mapped to business roles); renumber accordingly Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>