Finalize bounded typed pipeline implementation

docs/internal/llm.md

@@ -83,6 +83,12 @@ cancelled waiter that has already received a permit releases it.
 defers release on every result path. The effective limit and default are
 configuration facts in [Configuration](../config.md#defaults).
 
+This provider-call ceiling is independent of the pipeline's extract worker
+limit. Concurrent lanes, retries, and validators all use the same scheduled
+client, so increasing framework workers cannot exceed `total_llm`. Pipeline
+dispatch and cancellation mechanics are documented in
+[Pipeline Internals](pipeline.md#execution-flow).
+
 ## Prompt And Schema Assets
 
 `AssetRegistry` combines caller-owned prompt filesystems under stable prefixes