feat: claude 4.5 global inference profiles

[sarayev]

Problem

AWS Bedrock introduced global cross-region inference profiles that enable automatic cross-region routing for improved availability and performance. The current implementation only supports regular foundation models and doesn't handle the special IAM permission requirements for global inference profiles.

Issue number, if available: N/A

Changes

Added comprehensive support for AWS Bedrock global cross-region inference profiles in the conversation handler construct:

1. Detection Logic: Identify global inference profiles by the global. prefix in modelId
2. Three-Part IAM Policy: Implement the required permission structure as per AWS Bedrock documentation:
   • Access to the inference profile in the requesting region
   • Access to the foundation model in the requesting region
   • Access to the global foundation model (enables cross-region routing with triple-colon ARN)
3. Code Refactoring:
   • Extracted permission logic into categorizeModelResources() method
   • Added helper methods: isGlobalInferenceProfile(), extractFoundationModelId(), buildInferenceProfileArn(), buildFoundationModelArn(), buildGlobalFoundationModelArn()
4. Comprehensive Documentation: Added JSDoc comments explaining the three-part policy requirement with link to AWS documentation

Corresponding docs PR, if applicable: N/A

Validation

• Unit Tests: Added comprehensive test coverage (all tests passing):
  • Single global inference profile with three-part IAM policy verification
  • Multiple global inference profiles
  • Mix of regular models and global inference profiles
  • Stack region handling for inference profiles
  • All existing tests continue to pass
• Manual Testing: Verified deployment with Claude Sonnet 4.5 global inference profile in test application
• AWS Documentation: Implementation follows official AWS Bedrock documentation: https://docs.aws.amazon.com/bedrock/latest/userguide/global-cross-region-inference.html

Checklist

• If this PR includes a functional change to the runtime behavior of the code, I have added or updated automated test coverage for this change.
• If this PR requires a change to the Project Architecture README, I have included that update in this PR.
• If this PR requires a docs update, I have linked to that docs PR above.
• If this PR modifies E2E tests, makes changes to resource provisioning, or makes SDK calls, I have run the PR checks with the run-e2e label set.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[changeset-bot]

🦋 Changeset detected

Latest commit: 89f8826

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@aws-amplify/ai-constructs	Minor

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[ShadowCat567]

Looks good! Excited to have this feature available :D