dcsv-io 

Domain-safe i18n slice for D2 — the TKMessage primitive and the ITranslator interface, with zero external dependencies.

Type-safe TK constants catalog for D2 — one TKMessage per translation key, code-generated from the message catalog.

Foundational zero-dependency leaf exposing the closed ErrorCategory classification carried by every D2Result and error code in D2.

D2Result — the errors-as-values pattern for D2, replacing exception-based control flow with TKMessage-typed user-facing messages.

Foundational boundary helpers for D2 — Falsey/Truthy semantics, string cleaning, parse-or-default extensions, indexed env-var parsing, and JSON-cycle-safe serialization.

Identity and authorization vocabulary plus consumer-side runtime contracts for D2 inbound auth — value types, constants, and read-only interfaces.

Deterministic timestamp handling for D2 — a dependency-injected clock seam, temporal storage types, and NodaTime to PostgreSQL EF Core wiring.

Read-only IAuthContext interface for reasoning about caller identity, organization, scopes, and impersonation context in D2.

Spec-driven request-context primitives for D2 — IRequestContext, MutableRequestContext, and the cross-hop propagation codecs.

Strongly-typed ISO geo reference-data type surface for D2 (countries, subdivisions, currencies, languages, locales, timezones) without catalog data.

Validation contract surface for D2 — email, phone, and postal-code validator interfaces, shared field-length bounds, and the name/sex taxonomy enums.

Domain-safe slice of the D2 handler stack — IHandler, IHandlerContext, and HandlerOptions.

Shared abstractions for the D2 cache stack — the ILocalCache / IDistributedCache / ITieredCache marker interfaces and the invalidation backplane contract.

BaseHandler for D2 — the abstract base every handler inherits, providing scope pre-checks, OpenTelemetry activity and metrics, log scope, and a universal try/catch.

Reusable Entity Framework Core mapping for the DcsvIo.D2.Contacts value objects, applied via infra IEntityTypeConfiguration.

GDPR anonymization markers and the engine seam for D2 entity models — domain-safe, without EF Core or DI.

SPIFFE workload-identity value object and peer validator for D2 mTLS — the subject-alternative-name a leaf certificate carries and the trust-domain grammar.

Runtime translation library for D2 — Translator, the env-driven SupportedLocales registry, and the AddD2I18n DI extension.

RFC 7807 ProblemDetails wire-format catalog for D2 — type-URI prefix, extension keys, per-status titles, and the TitleFor helper.

Vocabulary for repo-flavored D2 handlers — the database-failure discrimination contract (unique, FK, deadlock, concurrency, connection), zero infrastructure dependencies.