feat(llm): add AWS Bedrock provider

[pragyan-amp]

Summary

Adds AWS Bedrock as an LLM provider option alongside Databricks, enabling AWS partnership
opportunities and customer flexibility.

Key Features

• AWS Bedrock Provider: Full implementation using Converse API for unified access to foundation
  models (Claude, Llama, Titan, Nova)
• AWS SSO Support: Works with aws sso login and standard boto3 credential chain (env vars, IAM
  roles)
• Tool Calling: Full support for function calling required by agent workflows
• Message Translation: Automatic OpenAI ↔ Bedrock Converse API format conversion
• Factory Integration: Uses existing LLMProviderFactory pattern for provider selection

Configuration

# Option 1: AWS SSO (recommended)
aws sso login --profile your-profile
export AWS_PROFILE=your-profile

# Option 2: Environment variables
export AWS_ACCESS_KEY_ID=xxx
export AWS_SECRET_ACCESS_KEY=xxx
export AWS_REGION=us-east-1

# Set provider in config
chuck_data config set llm_provider aws_bedrock

Testing

• ✅ 20 new provider tests (initialization, chat, streaming, tool calling, error handling)
• ✅ All 491 existing tests still passing
• ✅ Integration validated with all command handlers (scan_pii, bulk_tag_pii, setup_stitch)

What Works

• Model listing via Bedrock catalog
• Chat completion with all supported models
• Tool calling (function definitions and execution)
• Error handling and validation
• AWS credential chain (SSO, env vars, IAM roles)

What Doesn't Work Yet

• Streaming responses (raises NotImplementedError)
• temperature, max_tokens, top_p parameters (not passed through)
• Rate limit retry logic
• Session token authentication

Documentation

• Complete setup guide in README
• Provider selection priority documented
• Model recommendations for tool calling
• AWS SSO configuration examples

[Copilot]

Pull Request Overview

This PR adds AWS Bedrock as a new LLM provider to the chuck_data project, implementing support for AWS's Converse API to enable interaction with foundation models like Claude, Llama, and Nova. The implementation follows the existing provider pattern and includes comprehensive test coverage.

Key Changes:

• Added AWSBedrockProvider class implementing the Converse API with tool calling support
• Added boto3 as an optional dependency under the aws extras group
• Integrated the new provider into the factory pattern with proper error handling

Reviewed Changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
chuck_data/llm/providers/aws_bedrock.py	New AWS Bedrock provider implementation with Converse API support, message/tool conversion, and model listing
chuck_data/llm/providers/init.py	Exports the new AWSBedrockProvider class
chuck_data/llm/factory.py	Removes f-string prefix from error messages (consistency fix)
pyproject.toml	Adds boto3>=1.28.0 as an optional dependency under the aws extras group
tests/unit/llm/test_factory.py	Factory tests for AWS Bedrock provider creation and configuration
tests/unit/llm/providers/test_aws_bedrock.py	Comprehensive behavioral tests for the AWS Bedrock provider
tests/unit/llm/providers/init.py	New test module initialization file

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[punit-naik-amp]

Code changes LGTM. But please document the progress as a video and post in the description if possible.