信越本線の line_symbol_shape を SQUARE に修正

[TinyKitten]

概要

信越本線（line_cd=11403, 高崎-横川区間）の line_symbol_shape を ROUND から SQUARE に修正します。

変更の種類

• バグ修正
• 新機能
• データの修正・追加
• リファクタリング
• ドキュメント
• CI/CD
• その他

変更内容

• data/2!lines.csv の line_cd=11403（信越本線）の line_symbol_shape を ROUND → SQUARE に修正

テスト

• cargo fmt --all -- --check が通ること
• cargo clippy -- -D warnings が通ること
• cargo test（SQLX_OFFLINE=true）が通ること

省略: コード本体に変更がないデータのみの修正のため、Rust 側のチェックはスキップ。

関連Issue

スクリーンショット（任意）

[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (1)

• data/2!lines.csv is excluded by !**/*.csv

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch data/shinetsu-line-symbol-shape

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