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

calculators/builder-adversary-min/run-01/machine-docs/JOURNAL-eval.md

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+# JOURNAL — phase eval
+
+## Implementation notes
+
+- `evaluate()` walks the AST recursively using isinstance checks on Num/BinOp/Unary.
+- `_coerce()` converts whole-valued floats to int (e.g. `4/2 → 2`).
+- Division by zero raises `EvalError` (not the bare `ZeroDivisionError`).
+- `calc.py` CLI catches `LexError`, `ParseError`, `EvalError` and prints to stderr with exit 1.
+- Test suite has 49 total tests (lex + parse + eval); CLI tests use subprocess to exercise the full pipeline end-to-end.