feat: add pipeline bridge for NATS to Argo/Kubeflow

- pipeline_bridge.py: Standalone bridge service
- pipeline_bridge_v2.py: handler-base version
- Supports Argo Workflows and Kubeflow Pipelines
- Workflow monitoring and status publishing
- Dockerfile variants for standalone and handler-base

Dockerfile.v2

@@ -0,0 +1,12 @@
+# Pipeline Bridge v2 - Using handler-base
+ARG BASE_TAG=local
+FROM ghcr.io/billy-davies-2/handler-base:${BASE_TAG}
+
+WORKDIR /app
+
+# Additional dependency for Kubernetes API
+RUN uv pip install --system --no-cache kubernetes>=28.0.0
+
+COPY pipeline_bridge_v2.py ./pipeline_bridge.py
+
+CMD ["python", "pipeline_bridge.py"]