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

calculators/builder-adversary-lean/run-04/machine-docs/JOURNAL-lex.md

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+# JOURNAL — phase lex
+
+## Session start 2026-06-15
+
+Read phase plan. Mission: build calc/lexer.py with tokenize() and test suite.
+
+Token kinds: NUMBER, PLUS, MINUS, STAR, SLASH, LPAREN, RPAREN, EOF.
+Token has at least kind and value.
+LexError for invalid characters.
+
+Starting implementation.
+
+## Implementation complete
+
+Created:
+- calc/__init__.py (empty package marker)
+- calc/lexer.py (Token dataclass, LexError, tokenize)
+- calc/test_lexer.py (13 tests covering D1-D3)
+
+Test run:
+```
+$ python -m unittest -q
+Ran 13 tests in 0.000s
+OK
+```
+
+Plan verification commands:
+```
+$ python -c "from calc.lexer import tokenize; print([(t.kind,t.value) for t in tokenize('3.5*(1-2)')])"
+[('NUMBER', 3.5), ('STAR', '*'), ('LPAREN', '('), ('NUMBER', 1), ('MINUS', '-'), ('NUMBER', 2), ('RPAREN', ')'), ('EOF', None)]
+
+$ python -c "from calc.lexer import tokenize; tokenize('1 @ 2')"
+calc.lexer.LexError: unexpected character '@' at position 2
+```
+
+Claimed D1 (sha 8cb68d2), D2 (sha ac701e0), D3 (sha ed9b554), D4 (sha 6544e45).
+Awaiting Adversary verification.