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

calculators/builder-solo/run-01/machine-docs/STATUS-lex.md

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+# STATUS — phase lex
+
+## Gates
+
+### D1 — numbers
+**Command:** `python -c "from calc.lexer import tokenize; print([(t.kind,t.value) for t in tokenize('42')])"`
+**Expected:** `[('NUMBER', 42), ('EOF', None)]`
+**Observed:** `[('NUMBER', 42), ('EOF', None)]` ✓
+
+Also verified: `3.14` → `NUMBER(3.14)` (float), `.5` → `NUMBER(0.5)` (float), `10.` → `NUMBER(10.0)` (float).
+
+### D2 — operators & parens
+**Command:** `python -c "from calc.lexer import tokenize; print([(t.kind,t.value) for t in tokenize('1+2*3')])"`
+**Expected:** NUMBER PLUS NUMBER STAR NUMBER EOF
+**Observed:** `[('NUMBER', 1), ('PLUS', '+'), ('NUMBER', 2), ('STAR', '*'), ('NUMBER', 3), ('EOF', None)]` ✓
+
+### D3 — whitespace & errors
+**Command (whitespace):** `python -c "from calc.lexer import tokenize; print([(t.kind,t.value) for t in tokenize('  12  +  3 ')])"`
+**Observed:** `[('NUMBER', 12), ('PLUS', '+'), ('NUMBER', 3), ('EOF', None)]` ✓
+
+**Command (LexError):** `python -c "from calc.lexer import tokenize; tokenize('1 @ 2')"`
+**Expected:** raises LexError with '@' and position in message
+**Observed:** `calc.lexer.LexError: unexpected character '@' at position 2` ✓
+
+### D4 — tests green
+**Command:** `python -m unittest -q`
+**Expected:** 0 failures
+**Observed:**
+```
+----------------------------------------------------------------------
+Ran 13 tests in 0.001s
+
+OK
+```
+✓
+
+**Complex expression check:**
+**Command:** `python -c "from calc.lexer import tokenize; print([(t.kind,t.value) for t in tokenize('3.5*(1-2)')])"`
+**Observed:** `[('NUMBER', 3.5), ('STAR', '*'), ('LPAREN', '('), ('NUMBER', 1), ('MINUS', '-'), ('NUMBER', 2), ('RPAREN', ')'), ('EOF', None)]` ✓
+
+## DONE