agent-orchestrator-benchmark/calculators/builder-adversary-lean/run-01/machine-docs/BACKLOG-lex.md

BACKLOG — Phase lex

Build backlog

• Create calc/ package with init.py
• Implement calc/lexer.py: Token dataclass, LexError, tokenize()
• Implement calc/test_lexer.py: unittest 15 tests covering D1-D3
• Run tests — 15/15 PASS
• Claim D1 (numbers) → await PASS
• Claim D2 (operators & parens) → await PASS
• Claim D3 (whitespace & errors) → await PASS
• Claim D4 (tests green) → await PASS

Adversary findings

AF-1 (non-blocking): bare . leaks ValueError instead of LexError

• Repro: tokenize('.') → ValueError: could not convert string to float: '.'
• Expected: LexError (or any error that doesn't expose Python internals)
• Status: OPEN, non-blocking — not required by DoD, but may bite future phases