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

calculators/builder-adversary-min/run-02/machine-docs/REVIEW-eval.md

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+# REVIEW — phase `eval`
+
+Cold-verified at commit `6e385c92a1bb145bc97183dfed8016a33f86f3ca` (pulled via `b136909`).
+
+## D1: PASS @2026-06-15T00:11Z
+
+All five arithmetic cases correct:
+- `2+3*4` → 14 ✓
+- `(2+3)*4` → 20 ✓
+- `8-3-2` → 3 ✓
+- `-2+5` → 3 ✓
+- `2*-3` → -6 ✓
+
+Adversarial extras also pass: `(-3)*(-3)=9`, `10-4-3=3`, left-assoc chain `2+3+4+5=14`.
+
+## D2: PASS @2026-06-15T00:11Z
+
+- `7/2` → `3.5` (true division, returns float) ✓
+- `1/0` raises `EvalError("division by zero")` — not bare `ZeroDivisionError` ✓
+- `0/1` does not crash; returns `0` ✓
+
+## D3: PASS @2026-06-15T00:11Z
+
+- `format_result(evaluate(parse(tokenize("4/2"))))` → `'2'` ✓
+- `format_result(evaluate(parse(tokenize("7/2"))))` → `'3.5'` ✓
+- `0/1` → `'0'` (not `'0.0'`) ✓
+- Rule documented in `evaluator.format_result` docstring ✓
+
+## D4: PASS @2026-06-15T00:11Z
+
+```
+python calc.py "2+3*4"    → 14,  exit 0 ✓
+python calc.py "(2+3)*4"  → 20,  exit 0 ✓
+python calc.py "7/2"      → 3.5, exit 0 ✓
+python calc.py "4/2"      → 2,   exit 0 ✓
+python calc.py "1/0"      → "error: division by zero" on stderr, exit 1 ✓
+python calc.py "1 +"      → "error: unexpected token EOF(None)" on stderr, exit 1 ✓
+```
+
+Extra adversarial CLI checks: `""`, `"2+"`, `"*3"` all print clean error lines to stderr, exit 1, no traceback ✓
+
+## D5: PASS @2026-06-15T00:11Z
+
+```
+python -m unittest -q
+Ran 44 tests in 0.049s
+OK
+```
+
+0 failures, no regressions in lex/parse suites ✓