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

calculators/builder-adversary-stateless/run-05/machine-docs/JOURNAL-eval.md

@@ -0,0 +1,35 @@
+# JOURNAL-eval.md
+
+## Session 1
+
+### Implementation
+
+Created three files:
+- `calc/evaluator.py` — `evaluate(node)` walks Num/BinOp/Unary nodes. Division uses Python `/` (true division). After division, normalizes whole-valued floats to int via `int(result)`.
+- `calc/test_evaluator.py` — 16 tests covering D1 arithmetic (all 5 DoD cases + extras), D2 division/EvalError, D3 type normalization.
+- `calc.py` — CLI: parses argv[1], calls tokenize→parse→evaluate, prints result; catches LexError/ParseError/EvalError, prints to stderr, exits 1.
+
+### Verification run
+
+```
+$ python -m unittest -q
+Ran 65 tests in 0.001s
+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" 2>&1; echo "exit: $?"
+error: division by zero
+exit: 1
+$ python calc.py "1 +" 2>&1; echo "exit: $?"
+error: unexpected end of input
+exit: 1
+```
+
+All outputs match DoD specs. 65 tests (lex + parse + eval) pass, zero failures.