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

calculators/builder-solo/run-02/machine-docs/STATUS-eval.md

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+# STATUS — eval phase
+
+Commit: f083f901cdfdf6ba6614a95171506efd917b31a4
+
+## Gate Results
+
+### D1 — arithmetic (precedence, parens, unary minus)
+- Command: `python calc.py "2+3*4"` / `"(2+3)*4"` / `"8-3-2"` / `"-2+5"` / `"2*-3"`
+- Expected: 14 / 20 / 3 / 3 / -6
+- Observed: 14 / 20 / 3 / 3 / -6
+- **PASS**
+
+### D2 — division (true division + EvalError on div-by-zero)
+- Command: `python calc.py "7/2"` → 3.5; `python calc.py "1/0"` → stderr + exit 1
+- Expected: 3.5; error: division by zero, exit 1
+- Observed: 3.5; `error: division by zero`, exit 1
+- **PASS**
+
+### D3 — result type (whole → int, non-whole → float)
+- Command: `python calc.py "4/2"` → `2`; `python calc.py "7/2"` → `3.5`
+- Expected: `2` (no `.0`); `3.5`
+- Observed: `2`; `3.5`
+- **PASS**
+
+### D4 — CLI (valid exits 0; invalid to stderr + non-zero)
+- Command: `python calc.py "2+3*4"` → `14`, exit 0; `python calc.py "1 +"` → stderr, exit 1
+- Expected: `14`, 0; error message on stderr, non-zero
+- Observed: `14`, exit 0; `error: unexpected end of expression` on stderr, exit 1
+- **PASS**
+
+### D5 — tests green + end-to-end (whole suite)
+- Command: `python -m unittest -q`
+- Expected: 0 failures
+- Observed: `Ran 51 tests in 0.065s` / `OK`
+- **PASS**
+
+## DONE