Refactor configuration and assessment modules; add S3 integration and update LLM client usage

.env.example

@@ -1,16 +1,17 @@
-# LLM Configuration
-# Defaults to OpenRouter if not specified
+# Database Configuration
+HELIA_MONGO_URI=mongodb://localhost:27017
+HELIA_DATABASE_NAME=helia
 
-# Base URL for the LLM provider (default: https://openrouter.ai/api/v1)
-HELIA_LLM_BASE_URL=https://openrouter.ai/api/v1
+# S3 Configuration (MinIO or AWS)
+# Required for finding and downloading transcripts
+HELIA_S3_ENDPOINT=https://s3.amazonaws.com
+HELIA_S3_ACCESS_KEY=your_access_key
+HELIA_S3_SECRET_KEY=your_secret_key
+HELIA_S3_BUCKET=your-bucket-name
+HELIA_S3_REGION=us-east-1
 
-# API Key. Checked in order: HELIA_LLM_API_KEY, OPENROUTER_API_KEY, OPENAI_API_KEY
-HELIA_LLM_API_KEY=sk-or-your-api-key-here
-
-# Model identifier (default: google/gemini-3.0-pro-preview)
-HELIA_LLM_MODEL=google/gemini-3.0-pro-preview
-
-# Neo4j Configuration
-NEO4J_URI=bolt://localhost:7687
-NEO4J_USER=neo4j
-NEO4J_PASSWORD=password
+# LLM API Keys
+# These are used by the run configuration YAML via ${VAR} substitution
+OPENAI_API_KEY=sk-...
+ANTHROPIC_API_KEY=sk-ant-...
+OPENROUTER_API_KEY=sk-or-...