Improve project-local pi config (#6309)

* feat(coding-agent): improve config resource overrides

* fix(coding-agent): simplify config resource overrides

packages/coding-agent/src/core/settings-manager.ts

@@ -66,11 +66,13 @@ export type TransportSetting = Transport;
  * Package source for npm/git packages.
  * - String form: load all resources from the package
  * - Object form: filter which resources to load
+ * - autoload=false: start empty and only apply explicit resource patterns
  */
 export type PackageSource =
 	| string
 	| {
 			source: string;
+			autoload?: boolean;
 			extensions?: string[];
 			skills?: string[];
 			prompts?: string[];