fix: add Bridge.run() to loop() so MCU processes incoming RPCs

Without Bridge.run() in loop(), the MCU never reads incoming
draw_frame requests from the router. First frame goes through
during setup handshake, but subsequent frames fill the router's
send buffer and the viz stalls.

justfile

@@ -342,7 +342,8 @@ kconfig:
 flash-sketch:
     @ssh {{SSH_OPTS}} "{{BOARD_USER}}@{{BOARD_HOST}}" "\
         cd {{REPO_DIR}} && \
-        arduino-cli compile --upload --fqbn arduino:zephyr:unoq sketch/"
+        INCS=\$(find /home/arduino/Arduino/libraries -type d -not -path '*/Arduino_RouterBridge*' -not -path '*/Arduino_RPClite*' 2>/dev/null | sort -u | sed 's/^/-I/' | tr '\n' ' ') && \
+        arduino-cli compile --upload --fqbn arduino:zephyr:unoq --build-property \"build.extra_flags=\$INCS\" sketch/"
 
 # Validate all .pd files using Conftest/OPA Rego policies
 validate: