chore(ci): switch Claude Code review model to opus

[fyzanshaik-atlan]

Summary

• Upgrades the Claude Code Action workflow from claude-sonnet-4 to claude-opus-4 for higher-quality PR reviews
• The /review skill and all other workflow configuration remain unchanged

Test plan

• Trigger @claude review on a test PR to verify opus model is used and the /review skill produces structured output with confidence scoring and mermaid diagrams

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR upgrades the Claude Code GitHub Action workflow from claude-sonnet-4 to claude-opus-4 model. This is a single-line configuration change that switches to a more capable model for PR reviews.

• Changed model parameter from claude-sonnet-4 to claude-opus-4 on line 51
• All other workflow configuration remains unchanged, including the /review skill integration
• The model upgrade should provide higher-quality reviews with better reasoning capabilities

Confidence Score: 5/5

• This PR is safe to merge with no risk
• This is a minimal, low-risk configuration change that only updates a model parameter. The change is syntactically correct, and switching from Sonnet to Opus is a straightforward model upgrade with no breaking changes to the workflow logic.
• No files require special attention

Important Files Changed

Filename	Overview
.github/workflows/claude.yml	Upgraded Claude model from sonnet-4 to opus-4 for higher quality reviews

_{Last reviewed commit: 406d832}

[Aryamanz29]

thanks @fyzanshaik-atlan!