feat(coding-agent): refine resource metadata and display

packages/coding-agent/examples/sdk/03-custom-prompt.ts

@@ -10,6 +10,7 @@ import { createAgentSession, DefaultResourceLoader, SessionManager } from "@mari
 const loader1 = new DefaultResourceLoader({
 	systemPromptOverride: () => `You are a helpful assistant that speaks like a pirate.
 Always end responses with "Arrr!"`,
+	// Needed to avoid DefaultResourceLoader appending APPEND_SYSTEM.md from ~/.pi/agent or <cwd>/.pi.
 	appendSystemPromptOverride: () => [],
 });
 await loader1.reload();