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

calculators/builder-adversary-deferred/run-03/machine-docs/BACKLOG-parse.md

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+# Backlog — parse phase
+
+## Build backlog
+
+All items complete.
+
+- [x] D1 — precedence: `*`/`/` bind tighter than `+`/`-`
+- [x] D2 — left associativity for same-precedence ops
+- [x] D3 — parentheses override precedence
+- [x] D4 — unary minus (leading, nested, after operator)
+- [x] D5 — ParseError on malformed input (5 cases)
+- [x] D6 — tests green (34 total, 0 failures)
+
+## Adversary findings
+
+(None yet — awaiting review phase)