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

calculators/builder-solo/run-05/machine-docs/JOURNAL-parse.md

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+# JOURNAL-parse
+
+## 2026-06-15 — Phase start
+
+Reading plan. Building recursive-descent parser with:
+- Grammar: expr → term ((+|-) term)*; term → factor ((*|/) factor)*; factor → NUMBER | ( expr ) | - factor
+- AST nodes: Num, BinOp, Unary
+- ParseError exception
+
+Plan: implement parser.py, test_parser.py, verify all D1–D6, then certify.