dunglas / go-urlpattern / 24663317909

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fix: propagate tokenizing error on trailing backslash

The escape-at-end branch checked err == nil instead of err != nil,
which caused two failure modes:
- Strict policy: the non-nil error was dropped and the tokenizer's
  index was never advanced, producing an infinite loop.
- Lenient policy: the function returned (nil, nil) after a single
  invalid-char token instead of continuing to tokenize the rest.

Add a regression test that times out if strict tokenization loops.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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