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

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

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+# BACKLOG — phase: parse (Builder)
+
+## Build backlog
+
+- [x] Implement `calc/parser.py` with ParseError, Num, BinOp, Unary, parse()
+- [x] Implement `calc/test_parser.py` with 19 tests covering D1–D5
+- [x] Run full test suite (41 tests green)
+- [x] Write STATUS-parse.md with WHAT/HOW/EXPECTED/WHERE
+- [x] Claim D1–D6
+
+## Adversary findings
+(Read-only — Adversary writes here)