Add Global Cross-Region Inference and Claude Opus 4.5 Support

[sebsto]

Overview

This PR introduces global cross-region inference capability for Claude v4.5 models, adds support for Claude Opus 4.5, and includes a new InvokeModel example.

Key Changes

1. Global Cross-Region Inference

• New Protocol: Introduced `GlobalCrossRegionInferenceModality` protocol for models supporting global cross-region inference
  • Returns `"global."` prefix for model IDs
  • Documented with AWS reference: https://docs.aws.amazon.com/bedrock/latest/userguide/cross-region-inference.html
• Model Architecture: Created new wrapper structs for Claude v4.5 models to support global cross-region inference without duplicating `AnthropicText` class
  • New file: `AnthropicGlobalModels.swift` containing `Claude_Sonnet_v4_5` and `Claude_Opus_v4_5` structs
  • These structs delegate to `AnthropicText` while conforming to `GlobalCrossRegionInferenceModality`
• Logic Enhancement: Updated `getModelIdWithCrossRegionInferencePrefix()` to prioritize global cross-region inference over regional inference
• Model Support: Both Claude Sonnet 4.5 and Opus 4.5 now support global cross-region inference

2. Claude Opus 4.5 Support

• Added Claude Opus 4.5 model definition (`anthropic.claude-opus-4-5-20251101-v1:0`)
• Supports all advanced features: text generation, system prompts, document processing, vision, tool use, and reasoning
• Max tokens: 32,000 (default: 8,192)
• Max reasoning tokens: 8,191 (default: 4,096)

3. New InvokeModel Example

• Added new example project demonstrating InvokeModel API usage
  • Located in `Examples/invoke-model/`
  • Includes both Swift and Python implementations
  • Shows how to use the InvokeModel API with Claude models

Files Changed

• `Sources/BedrockService/BedrockRuntimeClient/Modalities/CrossRegionInference.swift` - Added global cross-region inference protocol
• `Sources/BedrockService/Models/Anthropic/AnthropicGlobalModels.swift` - New file with v4.5 model wrappers
• `Sources/BedrockService/Models/Anthropic/AnthropicBedrockModels.swift` - Added Opus 4.5 model definition
• `Sources/BedrockService/Models/BedrockModel.swift` - Updated cross-region inference logic
• `Examples/invoke-model/` - New example project

Breaking Changes

None - all changes are additive and maintain backward compatibility.

Documentation

• Added AWS documentation reference for cross-region inference
• Included inline documentation for new models and protocols