Product mechanisms — governing the shipped artifact

One of three roles in the catalogue. Product mechanisms govern the shipped accessibility-remediation artifact: how the document is modelled and accessed, how the remediation is validated and conformance-checked, how behaviour is regression-pinned, how mutations are made auditable, and how the repair move-space is bounded. (The artifact is produced by the agent fleet, through the models-bridge.)

The five families

1. Canonical models & seams — the one sanctioned typed model or seam per concern (document models, walkers, the cross-service client, the sole raw-Redis seam). 2. Validation & conformance — deterministic pass/fail checks over the artifact: content-fidelity, semantic lints, the standards/WCAG rule engine, cross-source coherence. 3. Regression tests — repeatable behaviour-pinning: the test-onion tiers, FsCheck property tests, fuzz campaigns, doc-derived-test pin-trailers. 4. Provenance & attribution — durable records of what the tool changed: per-mutator stamps, the F10 wiring lint, changelog derivation, the a11y_ prefix. 5. Repair vocabulary — the bounded move-space of the remediator: closed remediation-verb sets, typed violation/failure categories, the codemod-first threshold.

The reconciliation that lives here

Construction, held by a ban-lint. The Canonical models & seams family is typed models and seams — which the catalogue elsewhere says it "shows by example, never counts" (that is construction, not detection). The reconciliation is the catalogue's own rule: the typed model/seam is the construction mechanism (shown by example), and the entry's counted, enforced sensor is the ban-lint that holds it in place (the raw-PDF-library ban-lint, the raw-OpenXML ban-lint, the sole-seam lints). Each entry documents both; the Enforcement row is the lint. This is the same construction-held-by-detection pairing the models-bridge uses for its models and drift gates.

The census, forms, soft/hard axis, relationships, and entry template are documented once in the umbrella README.