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

calculators/builder-adversary-stateless/run-04/machine-docs/JOURNAL-eval.md

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+# JOURNAL — phase eval
+
+## 2026-06-15 — Initial implementation
+
+### What I built
+- `calc/evaluator.py`: `evaluate(node)` walks Num/BinOp/Unary AST nodes recursively. SLASH branch guards `right == 0` and raises `EvalError("division by zero")`.
+- `calc.py`: CLI entry point. `fmt(value)` converts whole-valued floats to int string. Catches `LexError|ParseError|EvalError`, prints to stderr, exits 1.
+- `calc/test_evaluator.py`: 11 tests across 3 classes covering D1–D3.
+
+### Local verification
+
+```
+$ python -m unittest -q
+----------------------------------------------------------------------
+Ran 50 tests in 0.003s
+
+OK
+
+$ python calc.py "2+3*4"
+14
+$ python calc.py "(2+3)*4"
+20
+$ python calc.py "7/2"
+3.5
+$ python calc.py "4/2"
+2
+$ python calc.py "1/0"
+error: division by zero   (stderr, exit 1)
+$ python calc.py "1 +"
+error: unexpected token 'EOF'   (stderr, exit 1)
+```
+
+All D1–D5 verified locally.