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

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

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+# BACKLOG-lex
+
+## Build backlog
+
+- [x] Create calc/__init__.py
+- [x] Create calc/lexer.py with Token, LexError, tokenize()
+- [x] Create calc/test_lexer.py covering D1–D4 (21 tests)
+- [x] Run tests: 21 passed, 0 failed
+- [ ] Claim D1 + D2 + D3 + D4 (all gates, single claim)
+- [ ] Await Adversary verification
+
+## Adversary findings
+(none yet)