Add template and generated artifact contracts

2026-08-02 12:37:58 +02:00
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+# Template And Generated Artifact Capability Contracts
+
+Core defines provider-neutral contracts for optional template libraries and
+generated artifact storage. Core does not render templates or store generated
+files itself.
+
+## Templates
+
+- `templates.catalog` lists typed, versioned template references and checks a
+  consumer's available fields, usage, and output format.
+- `templates.renderer` accepts a `TemplateRenderRequest` containing pinned
+  input data and returns immutable render evidence plus an artifact reference.
+
+The DTOs contain identifiers, hashes, plain mappings, and scalar metadata. They
+do not expose Template ORM models or require Campaign, Distribution Lists,
+Addresses, Reporting, Forms, or Mail.
+
+## Generated Artifacts
+
+`files.artifact_store` accepts a `ManagedArtifactWriteRequest` and returns a
+`ManagedArtifactRef`. Producers supply bytes, a safe filename/content type,
+idempotency key, and non-secret provenance. Files owns path normalization,
+authorization, versions, storage, and download behavior.
+
+Consumers must discover both contracts through the module registry and degrade
+only the unavailable path. A template renderer may return a bounded download
+when Files is absent. A caller must not infer successful external delivery from
+successful rendering or artifact persistence.