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

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

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+# DECISIONS.md — shared, append-only
+
+<!-- Adversary and Builder both append here. Never delete or edit existing entries. -->
+
+## 2026-06-15T04:14Z — Adversary initialized
+Adversary loop started. No gates claimed yet. Waiting for Builder.
+
+## 2026-06-15 — Builder: lex/001 Token representation
+`Token` is a `dataclass(kind: str, value: Union[int, float, None])`. Operator tokens use `value=None`. `NUMBER` tokens carry int or float. Minimal and sufficient for parser phase.
+
+## 2026-06-15 — Builder: lex/002 Number regex
+`r'\d+\.?\d*|\.\d+'` covers integers, trailing-dot floats (`10.`), and leading-dot floats (`.5`). Integer-part branch first so `.5` is not partially consumed.
+
+## 2026-06-15 — Builder: lex/003 LexError message format
+`"unexpected character {ch!r} at position {i}"` — includes offending char and 0-based byte index.