Add ADR 0016 recording the accepted module database access design (ModuleDatabase, the frozen
ModuleRuntimeServices boundary, one pool/one facade/one services-object identity, explicit
migrations, and the trust model), with narrow cross-reference corrections to ADR 0006 and ADR 0015
where their original text is now inaccurate. Sweep docs/development/api.md,
docs/development/authorization.md, docs/module-development/README.md, docs/development/testing.md,
and docs/development/identity.md for the new database boundary and remaining Phase 4C staleness;
correct the stale "Phase 4C is next" roadmap paragraph in platform-architecture.md and the matching
gap in README's current-status narrative. Extend the module template with a permissioned
GET /records route reading through context.services.database, using the canonical
createModuleTable helper, with matching template tests.
