fix: include artifacts directory in Docker image

Add COPY artifacts/ to Dockerfile so YAML files are available
for RAG indexing when the container starts.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Dockerfile

@@ -9,6 +9,9 @@ RUN pip install --no-cache-dir -r requirements.txt
 # Copy application code
 COPY app/ ./app/
 
+# Copy YAML artifacts for RAG indexing
+COPY artifacts/ ./artifacts/
+
 # Default model (API key must be passed at runtime for security)
 ENV OPENAI_MODEL=gpt-4o-mini