feat: implement RFS client with authentication and file management APIs

examples/rfsclient/auth_and_upload.rhai

@@ -0,0 +1,40 @@
+// RFS Client: Auth + Upload + Download example
+// Prereqs:
+// - RFS server reachable at RFS_BASE_URL
+// - Valid credentials in env: RFS_USER, RFS_PASS
+// - Run with herodo so the SAL Rhai modules are registered
+
+let BASE_URL = env_get("RFS_BASE_URL");
+let USER = env_get("RFS_USER");
+let PASS = env_get("RFS_PASS");
+let TIMEOUT = 30; // seconds
+
+if BASE_URL == null || BASE_URL == "" { throw "Set RFS_BASE_URL in your environment"; }
+if USER == null || PASS == null { throw "Set RFS_USER and RFS_PASS in your environment"; }
+
+// Create client
+let ok = rfs_create_client(BASE_URL, USER, PASS, TIMEOUT);
+if !ok { throw "Failed to create RFS client"; }
+
+// Optional health check
+let health = rfs_health_check();
+print(`RFS health: ${health}`);
+
+// Authenticate (required for some operations)
+let auth_ok = rfs_authenticate();
+if !auth_ok { throw "Authentication failed"; }
+
+// Upload a local file
+let local_file = "/tmp/rfs_example.txt";
+os_write_file(local_file, "hello rfs");
+let hash = rfs_upload_file(local_file);
+print(`Uploaded file hash: ${hash}`);
+
+// Download it back
+let out_path = "/tmp/rfs_example_out.txt";
+let dl_ok = rfs_download_file(hash, out_path);
+if !dl_ok { throw "Download failed"; }
+
+print(`Downloaded to: ${out_path}`);
+
+true