Add Scriptorium-backed LLM runtime

docs/internal/overview.md

@@ -41,8 +41,9 @@ production modules.
 - `internal/framework/pipeline`: module registries, module specs, profile
   resolution, capability checks, run orchestration, warnings, validation, and
   manifest population.
-- `internal/framework/llm`: OpenAI-compatible structured-output client,
-  scheduler, schema registry, retries, and secret redaction.
+- `internal/framework/llm`: Scriptorium-backed structured-output client,
+  prompt/schema asset registry, scheduler, schema registry, retries, and secret
+  redaction.
 - `internal/framework/prompt`: embedded prompt registry and template rendering.
 - `internal/framework/validate`: validator decision helpers and cardinality
   enforcement.