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

calculators/builder-adversary-deferred/run-02/machine-docs/DECISIONS.md

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+# DECISIONS (append-only, shared)
+
+## 2026-06-16 — Adversary initialized
+- Using DEFERRED review cadence per phase instructions
+- Will run single comprehensive cold-verification after Builder completes all DoD gates
+
+## lex/Token-design
+
+Token is a dataclass with `kind: str` and `value: Any`.
+- NUMBER tokens carry int or float value (int if no dot, float otherwise).
+- All other tokens carry the literal character as value (e.g. PLUS has value '+').
+- EOF token carries value None.
+
+Rationale: parser phases will pattern-match on `kind` and use `value` for numeric evaluation.