Extensions

Four extension surfaces: Scenario Heads (binding the generic engine to a specific application form — TCM differentiation, rehab, governance, …), Rule Packs (reusable fragments of the boundary DSL), MCP Connectors (read-only first, opening after Engineering Gate 2), and a Registry (extension metadata and versioning).

Every extension must clear the four admission gates first — root-anchor mapping, baseline consistency, reversible differentiation, boundary declaration. See Cosmology · §3.1 Admission tests.