Merge remote-tracking branch 'origin/master' into feat/todo-multi-in-progress

# Conflicts:
#	docs/core-data-structures/session.i18n.yaml

docs/core-data-structures/session.md

@@ -175,7 +175,7 @@ The request envelope — the `EpochHeader` (call config + rendered system prompt
  * canonical empty optional fields are absent.
  */
 interface EpochHeader {
-  /** The conversation's call configuration (provider, model, and sampling scalars). */
+  /** The conversation's call configuration (provider, model, reasoning effort, and sampling scalars). */
   config: LlmCallConfig
   /** Rendered system prompt text; absent for a system-less request. */
   system?: string