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

calculators/builder-solo/run-05/machine-docs/JOURNAL-lex.md

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+# JOURNAL-lex
+
+## 2026-06-15
+
+### Build
+
+Created `calc/__init__.py` (empty package marker) and `calc/lexer.py` implementing:
+- `Token` dataclass with `kind` (str) and `value` (int | float | None)
+- `LexError(Exception)` raised on invalid characters with offending char and position
+- `tokenize(src: str) -> list[Token]` covering numbers (int/float, leading/trailing dot), operators, parens, whitespace skipping, and error raising
+- `EOF` singleton token appended at end of every token list
+
+Created `calc/test_lexer.py` with 18 unittest cases covering D1–D3 including the three mandatory inputs.
+
+### Verification
+
+All four DoD gates observed passing:
+- D1: integers, floats (3.14, .5, 10.) tokenize correctly with right Python type
+- D2: all six operator/paren kinds correct; `1+2*3` yields expected sequence
+- D3: whitespace skipped; `@` raises LexError with position 2 in message
+- D4: 18 tests, 0 failures
+
+Commit: 70b71caacd1f7334e387ff15b007573201b524b6