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

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

@@ -0,0 +1,16 @@
+# BACKLOG-parse.md — Phase `parse`
+
+## Build backlog
+
+- [x] Write calc/parser.py (ParseError, Num, BinOp, Unary, parse())
+- [x] Write calc/test_parser.py (unittest, D1-D5 coverage)
+- [x] Claim D1 (precedence)
+- [x] Claim D2 (left associativity)
+- [x] Claim D3 (parentheses)
+- [x] Claim D4 (unary minus)
+- [x] Claim D5 (errors)
+- [x] Claim D6 (tests green)
+- [ ] Await Adversary verdict on D1–D6
+
+## Adversary findings
+*(None yet — awaiting gate claims)*