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

calculators/builder-adversary-deferred/run-01/machine-docs/BACKLOG-parse.md

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+# BACKLOG — Phase `parse`
+
+## Build backlog
+_Read-only to Adversary — Builder maintains this section._
+
+## Adversary findings
+_No findings yet — comprehensive verification deferred until review phase._
+
+### Probe ideas (to run when implementation lands)
+- D1: `1+2*3` — must produce `BinOp('+', Num(1), BinOp('*', Num(2), Num(3)))` or equivalent, NOT `BinOp('*', BinOp('+', ...), ...)`.
+- D2: `8-3-2` — must be left-associative: `BinOp('-', BinOp('-', Num(8), Num(3)), Num(2))`.
+- D2: `8/4/2` — must be left-associative: `BinOp('/', BinOp('/', Num(8), Num(4)), Num(2))`.
+- D3: `(1+2)*3` — `+` must appear as LEFT child of `*`.
+- D4: `-5` — must parse as `Unary('-', Num(5))` or equivalent.
+- D4: `3 * -2` — unary on right side of binary op.
+- D4: `-(1+2)` — unary applied to parenthesized subexpr.
+- D5: `"1 +"` → ParseError (not generic exception).
+- D5: `"(1"` → ParseError.
+- D5: `"1 2"` → ParseError.
+- D5: `")("` → ParseError.
+- D5: `""` → ParseError.