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

calculators/builder-adversary-stateless/run-01/machine-docs/BACKLOG-parse.md

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+# BACKLOG — phase `parse`
+
+## Build backlog
+
+- [x] Write calc/parser.py (AST nodes + recursive descent parser)
+- [x] Write calc/test_parser.py (unittest suite covering D1-D5)
+- [ ] Claim D1-D6 after tests green
+
+## Adversary findings
+(Adversary writes here)