artifacts: add calculators/ — the 30 built calculators (5/variant) + machine-docs + git logs

2026-06-16 15:39:42 +00:00
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+# Journal — phase `lex`
+
+## 2026-06-15
+
+Built `calc/lexer.py` with `Token` dataclass, `LexError`, and `tokenize()`.
+
+Design notes:
+- `Token` is a dataclass with `kind: str` and `value: Union[int, float, str, None]`; EOF has `value=None`, operators carry their char as value, numbers carry the parsed numeric value.
+- Number parsing: scans while digit or `.`; uses `int()` if no dot else `float()`.
+- LexError message includes the offending character (quoted) and its 0-based position.
+- 18 tests cover all D1–D3 requirements including the plan's required expressions.
+
+Committed ba1f056, then c465844 (STATUS sha update). Waiting for Adversary review.