tooling: Restore USB bind mount for hot-plug device detection.

Author: nedseb

.devcontainer/devcontainer.json

@@ -8,6 +8,7 @@
     // Privileged mode is required for firmware flashing and board communication.
     // This is incompatible with GitHub Codespaces but essential for local use.
     "privileged": true,
+    "mounts": ["type=bind,source=/dev/bus/usb,target=/dev/bus/usb"],
     "runArgs": ["--device=/dev/bus/usb"],
 
     "features": {