The Requirement and Marker parsers silently accept strings with trailing newline characters (LF, CRLF, etc.)…

The Requirement and Marker parsers silently accept strings with trailing newline characters (LF, CRLF, etc.)…: a task in repo2rlenv-swe-gen (Harbor dataset). The root cause is that the tokenizer's END rule uses Python's $ anchor, which — per Python's re semantics — also matches immediately before…