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

README.md

@@ -4,19 +4,10 @@ Text-based chat pipeline for the DaviesTechLabs AI/ML platform.
 
 ## Overview
 
-A NATS-based service that handles chat completion requests with RAG (Retrieval Augmented Generation).
+A NATS-based service that handles chat completion requests with RAG (Retrieval Augmented Generation). It uses the [handler-base](https://git.daviestechlabs.io/daviestechlabs/handler-base) library for standardized NATS handling, telemetry, and health checks.
 
 **Pipeline:** Query → Embeddings → Milvus → Rerank → LLM → (optional TTS)
 
-## Versions
-
-| File | Description |
-|------|-------------|
-| `chat_handler.py` | Standalone implementation (v1) |
-| `chat_handler_v2.py` | Uses handler-base library (recommended) |
-| `Dockerfile` | Standalone image |
-| `Dockerfile.v2` | Handler-base image |
-
 ## Architecture
 
 ```
@@ -88,19 +79,10 @@ NATS (ai.chat.request)
 ## Building
 
 ```bash
-# Standalone image (v1)
-docker build -f Dockerfile -t chat-handler:latest .
+docker build -t chat-handler:latest .
 
-# Handler-base image (v2 - recommended)
-docker build -f Dockerfile.v2 -t chat-handler:v2 .
-```
-
-## Dependencies
-
-The v2 handler depends on [handler-base](https://git.daviestechlabs.io/daviestechlabs/handler-base):
-
-```bash
-pip install git+https://git.daviestechlabs.io/daviestechlabs/handler-base.git
+# With specific handler-base tag
+docker build --build-arg BASE_TAG=latest -t chat-handler:latest .
 ```
 
 ## Related