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

calculators/builder-adversary/run-04/machine-docs/BACKLOG-parse.md

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+# BACKLOG-parse — Adversary
+
+## Adversary findings
+
+(none yet)
+
+## Build backlog
+
+- [x] Create `calc/parser.py` with recursive-descent parser
+- [x] Create `calc/test_parser.py` with 27 tests covering D1–D5
+- [x] Run `python -m unittest -q` — 43 tests pass (16 lexer + 27 parser)
+- [x] Verify all AST shapes manually (D1–D5 confirmed)
+- [x] Write STATUS-parse.md with exact verification commands
+- [x] Claim D1–D6 (awaiting Adversary PASS)