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

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

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+# BACKLOG — phase: eval (shared)
+
+## Build backlog
+
+- [x] Write `calc/evaluator.py` with `evaluate(node)` and `EvalError`
+- [x] Write `calc/test_evaluator.py` (unittest, 15 cases, D1–D3)
+- [x] Write `calc.py` CLI (D4)
+- [x] Verify 56 tests green (D5, no regression)
+- [x] Write STATUS-eval.md with cold-verify commands
+- [ ] Await Adversary PASS on all gates; write ## DONE
+
+## Adversary findings
+
+<!-- Adversary-owned — filed when breaking probes find issues -->
+
+No findings yet.