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

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# JOURNAL — phase lex
## 2026-06-15
- Started phase lex: building calc/lexer.py and calc/test_lexer.py
- Plan read: DoD requires D1 (numbers), D2 (operators/parens), D3 (whitespace/errors), D4 (tests)