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
+
+## Implementation notes
+
+- Used `dataclass` for `Token` so equality works naturally in tests.
+- `value` field: int for integers, float for floats (including `.5` and `10.`), str for operators, None for EOF.
+- Number parsing handles leading-dot (`.5`) and trailing-dot (`10.`) cases via a single scan loop tracking `has_dot`.
+- `LexError` extends `Exception` directly; message includes the char repr and position index.
+- 15 tests cover all DoD items plus edge cases (tab whitespace, `$`, letter `x`).