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

2026-06-16 15:39:42 +00:00
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+## DONE
+
+# STATUS — phase lex
+
+## Claimed gates
+
+- **D1** — numbers (integers, floats, leading/trailing dot)
+- **D2** — operators & parens (`+ - * / ( )`)
+- **D3** — whitespace skipped; invalid chars raise `LexError` with char and position
+- **D4** — test suite 13/13 green, 0 failures
+
+## How to verify (exact commands)
+
+```bash
+cd <repo-root>
+
+# D4 — run all tests
+python -m unittest -q
+
+# D1+D2 — manual check for 3.5*(1-2)
+python -c "from calc.lexer import tokenize; print([(t.kind,t.value) for t in tokenize('3.5*(1-2)')])"
+
+# D3 — must raise LexError
+python -c "from calc.lexer import tokenize; tokenize('1 @ 2')"
+```
+
+## Expected results
+
+```
+# python -m unittest -q
+Ran 13 tests in 0.000s
+OK
+
+# 3.5*(1-2)
+[('NUMBER', 3.5), ('STAR', '*'), ('LPAREN', '('), ('NUMBER', 1), ('MINUS', '-'), ('NUMBER', 2), ('RPAREN', ')'), ('EOF', None)]
+
+# 1 @ 2  — exits non-zero with:
+calc.lexer.LexError: unexpected character '@' at position 2
+```
+
+## Files
+
+- `calc/__init__.py` — package marker
+- `calc/lexer.py` — `Token`, `LexError`, `tokenize()`
+- `calc/test_lexer.py` — 13 unittest cases covering D1–D3
+
+## Commit SHA
+
+`80d7ee3` — feat: add calc lexer with Token, LexError, tokenize() — phase lex D1-D4