feat(cli): Use Anthropic via Amazon Bedrock

[taylor-hudson]

Add AWS Bedrock Support

Adds support for using AWS Bedrock as an alternative to the direct Anthropic API.

Configuration

Direct Anthropic API (Default)

shortest.config.ts

export default {
  anthropicKey: process.env.ANTHROPIC_API_KEY 
} satisfies ShortestConfig;

AWS Bedrock

export default {
  useBedrock: true,
  awsAccessKey: "your-aws-access-key", // or AWS_ACCESS_KEY_ID
  awsSecretKey: "your-aws-secret-key", // or AWS_SECRET_ACCESS_KEY  
  awsRegion: "us-east-1" // or AWS_REGION
}

Existing implementations using direct Anthropic API will continue to work without changes.

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[gladyshcodes]

Thank you for contributing, Taylor!

One thing here: do Anthropic and AnthropicBedrock share different interfaces? If so, it will be nice to create abstract class around them to make our code more scalable when we decide add more AI clients?

[taylor-hudson]

this is a good idea. i wrote this commit originally for my personal fork but saw someone else wanted it as well.

if i have the time, ill implement this. thanks for the feedback!

[gladyshcodes]

nice. we could actually merge this pr as is if it works as expected, and then you could open another pr with that impl if you have time

[rmarescu]

@taylor-hudson could you please sign the CLA so we can get this into review?