enable debug inspection on the example dataflow

`dora topic echo` and `dora topic hz` only read the wire when the dataflow asks
for it. Turning it on here means the velocities this node sends can be watched
live, and their cadence measured, without the bench printing anything and
without a robot — which is most of what testing this node with only a gamepad
needs.

Measured with it: the get_state poll runs at 1.88 Hz against a configured
STATE_POLL_S of 0.5.

dataflow.yml

@@ -11,6 +11,12 @@
 
 strict_types: true
 
+# Lets `dora topic echo` and `dora topic hz` read what is on the wire, so the
+# velocities this node sends can be watched without the bench printing them —
+# and without a robot. Costs nothing when nobody is looking.
+debug:
+  enable_debug_inspection: true
+
 nodes:
   - id: teleop
     path: dora-teleop