[bug] urml translate should not exception error out on KeyboardInterrupt

[slowrunner]

What component is affected

urml application

What I expected

Issuing ctrl-c should cleanly stop urml operations that are long running

What actually happened

issued ctrl-c to urml translate ...:

(gopigo3) ubuntu@U26LDave:~/LyricalDave/systests/urml/mygopigo3$ ./gopigo3_t3_remote.sh 
 15:30:27 up 13 days, 15:27,  3 users,  load average: 0.82, 1.11, 1.22
Starting remote translate
phrase: Announce 'Measuring distance',wait 3, measure distance, wait 3, announce the distance the sensor returned.
^CTraceback (most recent call last):
  File "/home/ubuntu/.venv/gopigo3/bin/urml", line 6, in <module>
    sys.exit(main())
             ~~~~^^
  File "/home/ubuntu/LyricalDave/systests/urml/URML/reference/validator/src/urml_validator/cli.py", line 503, in main
    rc: int = args.func(args)
              ~~~~~~~~~^^^^^^
  File "/home/ubuntu/LyricalDave/systests/urml/URML/reference/validator/src/urml_validator/cli.py", line 995, in cmd_translate
    result = bridge.translate(args.request)
  File "/home/ubuntu/LyricalDave/systests/urml/URML/reference/llm-bridge/src/urml_llm_bridge/bridge.py", line 150, in translate
    raw = self._provider.complete(
        system=system_prompt,
        user=user_request,
        schema=self._schema,
    )
  File "/home/ubuntu/LyricalDave/systests/urml/URML/reference/llm-bridge/src/urml_llm_bridge/providers/openai.py", line 123, in complete
    response = self._client.chat.completions.create(
        model=self._model,
    ...<5 lines>...
        max_tokens=max_tokens or self._default_max_tokens,
    )
  File "/home/ubuntu/.venv/gopigo3/lib/python3.14/site-packages/openai/_utils/_utils.py", line 298, in wrapper
    return func(*args, **kwargs)
  File "/home/ubuntu/.venv/gopigo3/lib/python3.14/site-packages/openai/resources/chat/completions/completions.py", line 1251, in create
    return self._post(
           ~~~~~~~~~~^
        "/chat/completions",
        ^^^^^^^^^^^^^^^^^^^^
    ...<52 lines>...
        stream_cls=Stream[ChatCompletionChunk],
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/home/ubuntu/.venv/gopigo3/lib/python3.14/site-packages/openai/_base_client.py", line 1332, in post
    return cast(ResponseT, self.request(cast_to, opts, stream=stream, stream_cls=stream_cls))
                           ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/.venv/gopigo3/lib/python3.14/site-packages/openai/_base_client.py", line 1037, in request
    response = self._send_request(
        request,
        stream=stream or self._should_stream_response_body(request=request),
        **kwargs,
    )
  File "/home/ubuntu/.venv/gopigo3/lib/python3.14/site-packages/openai/_client.py", line 478, in _send_request
    response = self._send_with_auth_retry(request, stream=stream, **kwargs)
  File "/home/ubuntu/.venv/gopigo3/lib/python3.14/site-packages/openai/_client.py", line 456, in _send_with_auth_retry
    response = super()._send_request(request, stream=stream, **kwargs)
  File "/home/ubuntu/.venv/gopigo3/lib/python3.14/site-packages/openai/_base_client.py", line 964, in _send_request
    return self._client.send(request, stream=stream, **kwargs)
           ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/httpx/_client.py", line 914, in send
    response = self._send_handling_auth(
        request,
    ...<2 lines>...
        history=[],
    )
  File "/usr/lib/python3/dist-packages/httpx/_client.py", line 942, in _send_handling_auth
    response = self._send_handling_redirects(
        request,
        follow_redirects=follow_redirects,
        history=history,
    )
  File "/usr/lib/python3/dist-packages/httpx/_client.py", line 979, in _send_handling_redirects
    response = self._send_single_request(request)
  File "/usr/lib/python3/dist-packages/httpx/_client.py", line 1014, in _send_single_request
    response = transport.handle_request(request)
  File "/usr/lib/python3/dist-packages/httpx/_transports/default.py", line 250, in handle_request
    resp = self._pool.handle_request(req)
  File "/usr/lib/python3/dist-packages/httpcore/_sync/connection_pool.py", line 256, in handle_request
    raise exc from None
  File "/usr/lib/python3/dist-packages/httpcore/_sync/connection_pool.py", line 236, in handle_request
    response = connection.handle_request(
        pool_request.request
    )
  File "/usr/lib/python3/dist-packages/httpcore/_sync/connection.py", line 103, in handle_request
    return self._connection.handle_request(request)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/usr/lib/python3/dist-packages/httpcore/_sync/http11.py", line 136, in handle_request
    raise exc
  File "/usr/lib/python3/dist-packages/httpcore/_sync/http11.py", line 106, in handle_request
    ) = self._receive_response_headers(**kwargs)
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/httpcore/_sync/http11.py", line 177, in _receive_response_headers
    event = self._receive_event(timeout=timeout)
  File "/usr/lib/python3/dist-packages/httpcore/_sync/http11.py", line 217, in _receive_event
    data = self._network_stream.read(
        self.READ_NUM_BYTES, timeout=timeout
    )
  File "/usr/lib/python3/dist-packages/httpcore/_backends/sync.py", line 128, in read
    return self._sock.recv(max_bytes)
           ~~~~~~~~~~~~~~~^^^^^^^^^^^
KeyboardInterrupt

Minimum reproduction

Not sure of minimum steps to repro. Steps I used:

1. Set environment vars for remote OpenAI LLM

URML_OPENAI_TIMEOUT=600
OPENAI_API_KEY=qwen3.5:9b
OPENAI_BASE_URL=http://10.0.0.xx:11434/v1

2. Issue urml translate with a phrase:

The script that invokes urml-translate:

#!/bin/bash

# optional:      --envelope envelope.yaml \

testnum=3
phrase="Announce 'Measuring distance',wait 3, measure distance, wait 3, announce the distance the sensor returned." \
model="qwen3.5:9b"
fn="${model//:/_}"

uptime
echo "Starting remote translate"
echo -e "phrase: $phrase"

time urml translate "$phrase" \
    --manifest gopigo3.manifest.yaml \
    --profile educational \
    --no-policy \
    --provider openai \
    --model $model \
    --save-rejected remote.$fn.gopigo3_t$testnum.rejected.out \
    --out remote.$fn.gopigo3_t$testnum.program.urml.yaml

uptime
echo "Done"

3. Invoke a long running (7 minutes expected) urml translate:

(gopigo3) ubuntu@U26LDave:~/LyricalDave/systests/urml/mygopigo3$ ./gopigo3_t3_remote.sh 
 15:30:27 up 13 days, 15:27,  3 users,  load average: 0.82, 1.11, 1.22
Starting remote translate
phrase: Announce 'Measuring distance',wait 3, measure distance, wait 3, announce the distance the sensor returned.

4. Ctrl-C

^C
(EXCEPTIONAL BARFING)

Environment

• URML version / commit: 0.2.0
• Operating system: Ubuntu 26.04
• Python / C++ / Rust toolchain version (if relevant): 3.14
• Substrate version (ROS 2 distro, PX4 release, etc., if relevant): GoPiGo3 manifest

Additional context

none