Add support for cross region inference

[sebsto]

#14

Cross Region inference :
https://docs.aws.amazon.com/bedrock/latest/userguide/cross-region-inference.html
https://docs.aws.amazon.com/bedrock/latest/userguide/inference-profiles-support.html

[Copilot]

Pull Request Overview

Adds the ability to prefix model IDs at runtime for cross-region Bedrock calls and updates existing models and invocation flows to use this new mechanism.

• Introduce CrossRegionInferenceModality protocol and apply it to supported model structs
• Strip hard-coded region prefixes from static model IDs and rely on getModelIdWithCrossRegionInferencePrefix(region:)
• Update request builders and service methods to accept a Region and prepend the region prefix dynamically

Reviewed Changes

Copilot reviewed 25 out of 25 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Sources/Modalities/CrossRegionInference.swift	New protocol defining how to generate region prefixes
Sources/Models/*	Add CrossRegionInferenceModality conformance and remove static IDs
Sources/BedrockModel.swift	Implement getModelIdWithCrossRegionInferencePrefix(region:)
Sources/InvokeModel/.swift & Sources/Converse/.swift	Change get*Input() signatures to accept a Region
Sources/ListModels/ModelSummary.swift	Remove default "us." fallback when mapping SDK summaries
README.md & Examples/*	Update static examples to remove hard-coded region prefixes

Comments suppressed due to low confidence (3)

Sources/InvokeModel/InvokeModelRequest.swift:208

• Changing the public API signature for getInvokeModelInput is a breaking change. To maintain backward compatibility, provide an overload or deprecate the old method before removal.

public func getInvokeModelInput(forRegion region: Region) throws -> InvokeModelInput {

Sources/Modalities/CrossRegionInference.swift:16

• [nitpick] Consider adding documentation comments to CrossRegionInferenceModality and its crossRegionPrefix(forRegion:) method to explain how prefixes are determined and when to adopt this protocol.

public protocol CrossRegionInferenceModality: Sendable {}

Sources/ListModels/ModelSummary.swift:62

• Removing the fallback prefix (us.\(modelId)) may cause bedrockModel to be nil for existing region-specific models. Consider reintroducing a default region prefix or using the current region context so that mapping still succeeds when listing models.

let bedrockModel = BedrockModel(rawValue: modelId)