refactor: prune core tool and prompt surface

packages/core/system-prompt/src/index.ts

@@ -360,7 +360,7 @@ export class SystemPrompt extends Service {
   private scopedVariableProviders = new Map<ScopeKey, Map<string, (context: AssembleContext) => string | undefined>>()
   private readonly toolOrder: string[] | undefined
 
-  constructor(ctx: Context, public config: Config) {
+  constructor(ctx: Context, config: Config) {
     super(ctx, 'systemPrompt')
     this.toolOrder = validateToolOrder(config.toolOrder)
     // The harness-owned openers. They live HERE (not on the loop plugin) so a