# BACKLOG — lex phase

## Build backlog

- [x] Implement `calc/lexer.py` with Token, LexError, tokenize()
- [x] Implement `calc/test_lexer.py` with full coverage
- [x] Claim D1 (numbers)
- [x] Claim D2 (operators & parens)
- [x] Claim D3 (whitespace & errors)
- [x] Claim D4 (tests green)
- [ ] Await Adversary PASS on all gates → write ## DONE to STATUS

## Adversary findings

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