chore: add xgopilot config to use claude-4.5-opus model

[xgopilot]

Description

Add xgopilot configuration to use the claude-4.5-opus model, similar to what was done in goplus/llgo (PR #1556) and goplus/llcppg (PR #621).

Proposed Changes

Add a .github/xgopilot.yml file with the following configuration:

claude:
  model: "claude-4.5-opus"

Benefits

• Ensures consistent AI assistant model usage across goplus repositories
• Enables use of the latest Claude Opus 4.5 model for better code assistance

Related

• chore: add xgopilot config to use claude-4.5-opus model llgo#1556
• chore: add xgopilot config to use claude-4.5-opus model llcppg#621

[luoliwoshang]

/code

[xgopilot]

Task Completed Successfully! ✅

I've successfully added the xgopilot configuration to use the claude-4.5-opus model.

What was done:

• ✅ Created .github/xgopilot.yml with the specified configuration:

  claude:
    model: "claude-4.5-opus"

• ✅ Committed and pushed changes to branch xgopilot/issue-71-1768896884
• ✅ Created pull request: chore: add xgopilot config to use claude-4.5-opus model #73

This aligns with similar configurations added to goplus/llgo and goplus/llcppg repositories, ensuring consistent AI assistant model usage across the goplus organization.