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Title: Missing string constraint matchers: does not begin with string , ends with string , does not end with…

Title: Missing string constraint matchers: does not begin with string , ends with string , does not end with…: a task in LegoFlow-SWE (Harbor dataset). Description The cgreen unit testing library currently provides string constraints like begins with string , contains string , is equal to string …

The task

**Description** The cgreen unit testing library currently provides string constraints like `begins_with_string`, `contains_string`, `is_equal_to_string`, etc., but three natural counterparts are missing, making it impossible to express certain string expectations directly:

Part of Lego-X/LegoFlow-SWE.