feat: use claude-sonnet-4-6 for dependabot auto-merge analysis

[Dorac]

Summary

• Switch Claude model from default (Opus 4.8) to claude-sonnet-4-6 for the Dependabot auto-merge analysis step
• Sonnet is sufficient for changelog analysis, bump type evaluation, and codebase usage grep — no need for Opus-level reasoning
• ~5x cost reduction per auto-merge run

Test plan

• Trigger a Dependabot PR and verify the auto-merge workflow runs with Sonnet
• Confirm comment quality is not degraded

PR Summary by Typo

Overview

This PR updates the Dependabot auto-merge workflow to utilize the claude-sonnet-4-6 model for analysis, aiming to improve the quality or efficiency of auto-merge decisions.

Key Changes

• The dependabot_auto_merge.yml workflow configuration was updated to specify claude-sonnet-4-6 as the model for the auto-merge analysis step.

Work Breakdown

Category	Lines Changed
New Work	1 (100.0%)
Total Changes	1

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Static Code Review 📊

✅ All quality checks passed!

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AI Code Review 🤖

Files Reviewed: 1
Comments Added: 0
Lines of Code Analyzed: 1
Critical Issues: 0

PR Health: Excellent 🔥

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