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

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

@@ -0,0 +1,13 @@
+# JOURNAL — phase lex
+
+## Approach
+
+- `Token` is a `dataclass` with `kind: str` and `value: Union[int, float, str, None]`.
+- `tokenize()` is a simple single-pass scanner using index `i`.
+- Numbers: greedy scan of digits and `.`; if `.` present → `float`, else → `int`.
+- Operators/parens: single-char dispatch via `_SINGLE` dict.
+- Whitespace (space, tab): skipped silently.
+- Anything else: raises `LexError` with the offending char and position.
+- `EOF` token appended at the end.
+
+## Test count: 13 — all green on first run.