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Lexer missing tokenize method after refactoring

Lexer missing tokenize method after refactoring: a task in harbor-swesmith-rl-artifacts: Harbor SWE-Smith 强化学习数据产物 (Harbor dataset). After a recent change, the Lexer class is missing the tokenize method, causing AttributeError when trying to parse templates.

The task

After a recent change, the Lexer class is missing the `tokenize` method, causing AttributeError when trying to parse templates.

Part of keryszhan/harbor-swesmith-rl-artifacts.