feat(coding-agent): export loadProjectContextFiles() standalone utility

closes #3142

packages/coding-agent/src/core/resource-loader.ts

@@ -73,7 +73,7 @@ function loadContextFileFromDir(dir: string): { path: string; content: string }
 	return null;
 }
 
-function loadProjectContextFiles(
+export function loadProjectContextFiles(
 	options: { cwd?: string; agentDir?: string } = {},
 ): Array<{ path: string; content: string }> {
 	const resolvedCwd = options.cwd ?? process.cwd();