feat(models): support US Claude Opus 4.5

[naorpeled]

PR Type

Enhancement

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Description

• Add support for US Claude Opus 4.5 model in Bedrock

• Configure 200000 token context window for new model

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Diagram Walkthrough

flowchart LR
  A["Model Configuration"] -- "Add US Claude Opus 4.5" --> B["bedrock/us.anthropic.claude-opus-4-5-20251101-v1:0"]
  B -- "Set context window" --> C["200000 tokens"]

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File Walkthrough

	Relevant files
Enhancement	__init__.py Add US Claude Opus 4.5 model configuration                              pr_agent/algo/init.py Added new Bedrock model entry for US Claude Opus 4.5 with model ID bedrock/us.anthropic.claude-opus-4-5-20251101-v1:0 Configured context window limit of 200000 tokens for the new model Inserted in appropriate alphabetical position within model configuration dictionary +1/-0

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🟢	No security concerns identified No security vulnerabilities detected by AI analysis. Human verification advised for critical code.
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🟢	Consistent Naming Conventions Objective: All new variables, functions, and classes must follow the project's established naming standards Status: Passed
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	Robust Error Handling Objective: Ensure potential errors and edge cases are anticipated and handled gracefully throughout the code Status: Passed
	Single Responsibility for Functions Objective: Each function should have a single, well-defined responsibility Status: Passed
	When relevant, utilize early return Objective: In a code snippet containing multiple logic conditions (such as 'if-else'), prefer an early return on edge cases than deep nesting Status: Passed

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[Copilot]

Pull request overview

This PR adds support for the US region-specific variant of Claude Opus 4.5 model in AWS Bedrock. The change enables users to access the Claude Opus 4.5 model deployed in the US region of AWS Bedrock.

Key Changes:

• Added US region-specific model identifier for Claude Opus 4.5 with appropriate context window configuration

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