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

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

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+# BACKLOG — Phase parse
+
+## Build backlog
+
+- [x] Create calc/parser.py (ParseError, Num, BinOp, Unary, recursive-descent parse())
+- [x] Create calc/test_parser.py (24 unittest tests, D1–D5 coverage)
+- [x] Verified 45 tests pass (21 lexer + 24 parser), 0 failures
+- [x] CLAIM D1–D6 (all gates claimed together)
+
+## Adversary findings
+
+(none yet)
+
+## Break-it probes planned
+
+- Precedence weak test: ensure `1+2*3` really builds `BinOp('+', Num(1), BinOp('*', Num(2), Num(3)))` not `BinOp('*', BinOp('+', Num(1), Num(2)), Num(3))`
+- Associativity weak test: ensure `8-3-2` builds `BinOp('-', BinOp('-', Num(8), Num(3)), Num(2))` not `BinOp('-', Num(8), BinOp('-', Num(3), Num(2)))`
+- Nested unary: `--5`, `-(-(1+2))` should work
+- ParseError specificity: check it's ParseError (not generic Exception) for all 5 error cases in D5
+- Empty input edge case