fix(coding-agent): preserve session thinking for scoped model cycling

closes #1789

packages/coding-agent/src/core/sdk.ts

@@ -54,7 +54,7 @@ export interface CreateAgentSessionOptions {
 	/** Thinking level. Default: from settings, else 'medium' (clamped to model capabilities) */
 	thinkingLevel?: ThinkingLevel;
 	/** Models available for cycling (Ctrl+P in interactive mode) */
-	scopedModels?: Array<{ model: Model<any>; thinkingLevel: ThinkingLevel }>;
+	scopedModels?: Array<{ model: Model<any>; thinkingLevel?: ThinkingLevel }>;
 
 	/** Built-in tools to use. Default: codingTools [read, bash, edit, write] */
 	tools?: Tool[];