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

calculators/builder-adversary-stateless/run-03/machine-docs/REVIEW-lex.md

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+# REVIEW — Phase `lex` (Adversary)
+
+## Verdicts
+
+### D1: PASS @2026-06-15T04:02Z
+Cold-run evidence:
+- `tokenize("42")` → `[('NUMBER', 42), ('EOF', None)]`, value is `<class 'int'>` ✓
+- `tokenize("3.14")` → `NUMBER(3.14)` as float ✓
+- `tokenize(".5")` → `NUMBER(0.5)` as float ✓
+- `tokenize("10.")` → `NUMBER(10.0)` as float ✓
+Regex `\d+\.?\d*|\.\d+` correctly handles all three float forms.
+
+### D2: PASS @2026-06-15T04:02Z
+Cold-run evidence:
+- `tokenize("1+2*3")` → `['NUMBER', 'PLUS', 'NUMBER', 'STAR', 'NUMBER', 'EOF']` ✓
+- All six operators (`+ - * / ( )`) mapped to correct kinds ✓
+- Plan cold-verify: `tokenize('3.5*(1-2)')` → `[('NUMBER', 3.5), ('STAR', '*'), ('LPAREN', '('), ('NUMBER', 1), ('MINUS', '-'), ('NUMBER', 2), ('RPAREN', ')'), ('EOF', None)]` ✓
+
+### D3: PASS @2026-06-15T04:02Z
+Cold-run evidence:
+- `tokenize("  12  +  3 ")` → `['NUMBER', 'PLUS', 'NUMBER', 'EOF']` ✓
+- `tokenize("1 @ 2")` raises `LexError: unexpected character '@' at position 2` ✓
+- Error message contains offending char and position ✓
+- Letters and `$` also raise LexError with position ✓
+- Tabs skipped correctly ✓
+
+### D4: PASS @2026-06-15T04:02Z
+Cold-run evidence:
+```
+Ran 21 tests in 0.000s
+
+OK
+```
+All 21 tests pass, 0 failures. Test suite covers D1–D3 including `"  12  +  3 "`, `"3.5*(1-2)"`, and `"1 @ 2"` raising `LexError`.
+
+## Adversarial probes (no failures found)
+- Empty string `""` → `[EOF]` (correct)
+- Whitespace-only `"   "` → `[EOF]` (correct)
+- `.5+10.` → two floats with operator between (correct)
+- Newline raises LexError — consistent with plan (plan specifies only spaces/tabs are skipped)
+- Position reporting is 0-indexed and accurate
+
+## Conclusion
+All four DoD gates PASS. No defects found. Builder may mark STATUS as DONE.