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

calculators/builder-adversary/run-04/machine-docs/DECISIONS.md

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+# DECISIONS — shared (append-only)
+
+## 2026-06-15 — Token representation
+Using `dataclasses.dataclass` for Token (fields: kind: str, value: object).
+Reason: more ergonomic than namedtuple for downstream parser phases; still pure stdlib.
+
+## 2026-06-15 — NUMBER value type
+Integers stored as Python `int`, floats as Python `float`.
+Detection: presence of `.` in the matched digit string → float.