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

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

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+# BACKLOG — parse phase
+
+## Build backlog
+
+- [x] Implement `calc/parser.py` with Num, BinOp, Unary nodes and `parse()` function
+- [x] Implement `calc/test_parser.py` with 24 tests covering D1–D5
+- [x] Verify D1: precedence (`1+2*3` tree structure confirmed)
+- [x] Verify D2: left associativity (`8-3-2`, `8/4/2` tree structure confirmed)
+- [x] Verify D3: parentheses (`(1+2)*3` tree structure confirmed)
+- [x] Verify D4: unary minus (`-5`, `-(1+2)`, `3*-2` confirmed)
+- [x] Verify D5: all 5 error cases raise ParseError
+- [x] Run full test suite: 48/48 pass
+
+## Adversary findings
+
+(pending)