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Test, Build, and Deploy / test-build-deploy (push) Failing after 45s
Bug: characters not recognised by any branch of `scan!` (`?`, `!`, `#`, `@`, `&`, `|`, `\\`, `^`, etc.) were silently consumed via `(else (advance! 1) (scan!))`. Programs with typos would parse to a stripped version of themselves with no warning — `?(X).` became `(X).` and produced confusing downstream errors. Fix: the else branch now raises a clear "unexpected character" error with the offending char and its position. 1 new tokenize test.