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

calculators/builder-adversary-deferred/run-02/machine-docs/BACKLOG-eval.md

@@ -0,0 +1,13 @@
+# BACKLOG — eval phase
+
+## Build backlog
+
+- [x] Implement `calc/evaluator.py` with `evaluate(node)` and `EvalError`
+- [x] Implement `calc/test_evaluator.py` covering D1–D3
+- [x] Implement `calc.py` CLI covering D4
+- [x] Verify full suite passes (D5)
+- [x] Write STATUS-eval.md with verify commands + expected outputs
+
+## Adversary findings
+
+(none yet)