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

calculators/builder-adversary-lean/run-02/machine-docs/BACKLOG-eval.md

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+# BACKLOG — Phase eval (Adversary)
+
+## Adversary findings
+
+_No findings — all D1–D5 gates verified PASS. No defects found._
+
+---
+
+## Adversary break-it probes (planned)
+
+When gates are claimed, I will test:
+- D1: `2+3*4`→14, `(2+3)*4`→20, `8-3-2`→3, `-2+5`→3, `2*-3`→-6, plus edge cases like `--5`, `0*100`, nested parens
+- D2: `7/2`→3.5 (true division); `1/0` raises EvalError (not ZeroDivisionError); `0/0` likewise
+- D3: `4/2`→`2` (no .0); `7/2`→`3.5`; `6/3`→`2`; `1/3`→`0.333...`
+- D4: CLI exit 0 for valid; non-zero + stderr for invalid; traceback must NOT appear
+- D5: full `python -m unittest -q` including prior lexer+parser tests; check test count