fix: resolve executor compile regressions

[KooshaPari]

Summary

• Fix syntax/parsing issue in mapModelToKiro block.
• Fix duplicated method in GitHub Copilot executor.
• Fix Codex websocket disconnect logger variable scope and remove unused imports.
• Fix short variable redeclare.

Files changed

Validation

• go test ./pkg/llmproxy/executor ./pkg/llmproxy/translator/kiro/claude -run TestDoesNotExist -count=0