debug: log endpoint model at build time and URB dispatch details

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cli/src/host.rs

@@ -164,6 +164,23 @@ fn build_usb_device(dev: nusb::Device, dev_info: nusb::DeviceInfo) -> Result<Usb
             alt_settings[0].interface_protocol,
             alt_settings.len()
         );
+        for (alt_idx, alt) in alt_settings.iter().enumerate() {
+            for ep in &alt.endpoints {
+                debug!(
+                    "  intf {intf_num} alt {alt_idx}: ep {:02x} type={} mps={} interval={}",
+                    ep.address,
+                    match ep.transfer_type() {
+                        Some(EndpointAttributes::Control) => "control",
+                        Some(EndpointAttributes::Isochronous) => "iso",
+                        Some(EndpointAttributes::Bulk) => "bulk",
+                        Some(EndpointAttributes::Interrupt) => "interrupt",
+                        None => "unknown",
+                    },
+                    ep.max_packet_size,
+                    ep.interval,
+                );
+            }
+        }
 
         interface_states.push(InterfaceState::with_alt_settings(alt_settings));
     }

lib/src/lib.rs

@@ -441,6 +441,8 @@ pub async fn handle_urb_loop<T: AsyncReadExt + AsyncWriteExt + Unpin + Send + 's
                             UsbIpResponse::usbip_ret_submit_fail(&header)
                         }
                         Some((ep, intf_idx)) => {
+                            debug!("URB seqnum={seqnum} ep={:02x} type={:?} dir={} intf={intf_idx:?} len={transfer_buffer_length}",
+                                ep.address, ep.transfer_type(), if out { "OUT" } else { "IN" });
                             let urb_request = UrbRequest {
                                 ep,
                                 transfer_buffer_length,