fix(preset): align minimal agent with RL composition

packages/preset/persona/src/index.ts

@@ -38,23 +38,27 @@ export interface Config {
    * variables. Empty text drops the section at render, matching the registry.
    */
   text: string
+  /** Make this persona the complete system prompt, suppressing every other section. */
+  complete?: boolean
 }
 
 /** Runtime schema for the persona row. */
 export const Config: z<Config> = z.object({
   text: z.string().required(),
+  complete: z.boolean().default(false),
 })
 
 /**
  * Register the persona section for the mounting context's scope.
  * @param ctx - an agent scope context; an unscoped context collides with the
  * prompt registry's own persona registration and rejects.
- * @param config - the persona text.
+ * @param config - the persona text and complete-prompt policy.
  */
 export function apply(ctx: Context, config: Config): void {
   ctx.effect(() => ctx.systemPrompt.section({
     name: PERSONA_SECTION,
     order: PERSONA_ORDER,
     text: config.text,
+    complete: config.complete ?? false,
   }), 'persona.section()')
 }

packages/preset/persona/src/invariant.ts

@@ -16,7 +16,8 @@ export const inject = ['invariants']
 
 /**
  * No runtime invariant: this row owns no event stream or mutable runtime data — it registers one
- * prompt section and the prompt registry owns section identity, shadowing, and disposal.
+ * prompt section and the prompt registry owns identity, complete-prompt enforcement, shadowing,
+ * and disposal.
  */
 const install: InvariantInstaller = () => {}