feat(bedrock): support Bedrock API key authentication

[RomneyDa]

Summary

• Add Bedrock API key authentication as an alternative to IAM credentials in the core LLM class (Bedrock.ts)
• When apiKey is set, uses bearer token auth via the AWS SDK's token provider; otherwise falls back to existing IAM credential flow
• Refactors client creation into a single _getClient() method used by _streamChat, _embed, and rerank (the OpenAI adapter already supported this)
• Adds docs section with YAML config example

Closes #6645

Test plan

• Configure Bedrock with apiKey field and verify chat/completions work with bearer token auth
• Verify existing IAM credential flow (profile, accessKeyId/secretAccessKey) still works unchanged
• Verify embed and rerank operations work with API key auth

---

Summary by cubic

Adds Bedrock API key authentication as an alternative to IAM. Enables bearer token auth for chat, embed, and rerank, and unifies client creation.

• New Features
  • Support apiKey in Bedrock.ts using AWS SDK token bearer auth; IAM flow unchanged.
  • New _getClient() used by _streamChat, _embed, and rerank.
  • Docs updated with YAML example for API key setup.

^{Written for commit 443ced2. Summary will update on new commits.}

[continue]

Documentation Review

No additional documentation updates are needed for this PR.

The PR already includes well-written documentation for the new Bedrock API key authentication feature:

• New section added: "Bedrock API Keys" under the authentication setup
• Clear example: Shows YAML configuration with secrets reference
• Proper placement: Listed before AWS credentials as it's the simpler auth method
• External reference: Links to AWS docs for more context

The documentation changes are appropriately scoped and match the level of detail in the existing Bedrock docs.

[cubic-dev-ai]

No issues found across 2 files

[mintlify]

Preview deployment for your docs. Learn more about Mintlify Previews.

Project	Status	Preview	Updated (UTC)
continue-docs	🟢 Ready	View Preview	Mar 25, 2026, 3:21 AM