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

calculators/builder-adversary/run-03/machine-docs/DECISIONS.md

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+# DECISIONS (append-only, shared)
+
+## D-001: Token representation
+Token is a dataclass with `kind: str` and `value` (int | float | None).
+NUMBER tokens carry their parsed numeric value; operator/paren tokens carry None.
+EOF carries None value.
+Rationale: parser phases can pattern-match on kind and directly use value without re-parsing.
+
+## D-002: Integer vs float distinction
+If a number string contains '.' it is parsed as float, otherwise int.
+Edge cases: '.5' → float(0.5), '10.' → float(10.0), '42' → int(42).