chore: switch Claude workflows from Foundry to AWS Bedrock

[aseembits93]

Summary

• Replace Azure Foundry (Microsoft) authentication with AWS Bedrock OIDC across all Claude Code GitHub Actions workflows
• Add aws-actions/configure-aws-credentials@v4 step to each job for OIDC-based authentication
• Update model identifiers from claude-opus-4-6 to the Bedrock format us.anthropic.claude-opus-4-6-v1:0
• Remove ANTHROPIC_FOUNDRY_API_KEY and ANTHROPIC_FOUNDRY_BASE_URL environment variables (no longer needed — AWS credentials are injected by the configure-aws-credentials action)

Affected workflows

• .github/workflows/claude.yml — both pr-review and claude-mention jobs
• .github/workflows/duplicate-code-detector.yml — detect-duplicates job

Required secrets

The following GitHub repository secrets must be configured before merging:

• AWS_ROLE_TO_ASSUME — ARN of the IAM role for OIDC federation
• AWS_REGION — AWS region where Bedrock is enabled

The old AZURE_ANTHROPIC_API_KEY and AZURE_ANTHROPIC_ENDPOINT secrets can be removed after this lands.

Test plan

• Verify AWS_ROLE_TO_ASSUME and AWS_REGION secrets are set in the repository
• Confirm the IAM role has Bedrock model access for us.anthropic.claude-opus-4-6-v1:0 (cross-region inference)
• Open a test PR to trigger the pr-review job and confirm it authenticates and runs successfully
• Test @claude mention in a PR comment to verify the claude-mention job
• Trigger the duplicate-code-detector workflow manually to verify

🤖 Generated with Claude Code

[aseembits93]

@Saga4 i have added the necessary secrets, you can force merge this one