refactor: consolidate to handler-base, migrate to pyproject.toml, add tests

README.md

@@ -61,13 +61,9 @@ The bridge publishes status updates as the workflow progresses:
 - `failed` - Failed
 - `error` - System error
 
-## Variants
+## Implementation
 
-### pipeline_bridge.py (Standalone)
-Self-contained service with pip install on startup. Good for simple deployments.
-
-### pipeline_bridge_v2.py (handler-base)
-Uses handler-base library for standardized NATS handling, telemetry, and health checks.
+The pipeline bridge uses the [handler-base](https://git.daviestechlabs.io/daviestechlabs/handler-base) library for standardized NATS handling, telemetry, and health checks.
 
 ## Environment Variables
 
@@ -81,11 +77,10 @@ Uses handler-base library for standardized NATS handling, telemetry, and health
 ## Building
 
 ```bash
-# Standalone version
 docker build -t pipeline-bridge:latest .
 
-# handler-base version
-docker build -f Dockerfile.v2 -t pipeline-bridge:v2 --build-arg BASE_TAG=latest .
+# With specific handler-base tag
+docker build --build-arg BASE_TAG=latest -t pipeline-bridge:latest .
 ```
 
 ## Testing