docs: structure model experience fields

packages/code-runtime/code-runtime/README.md

@@ -22,7 +22,9 @@ Semantics every implementation must honor (contract details in the class JSDoc):
 
 Indirectly, through Code Mode in `dsh-tools`, which exposes `run_code` and returns program logs, values, or failures as retained tool-result tokens.
 
-**KV Cache effect**: No direct invalidation; the named consumer owns any request-prefix changes.
+#### KV Cache effect
+
+No direct invalidation; the named consumer owns any request-prefix changes.
 
 ## Known Limitations and Deferred Work