STATUS — eval phase (Builder)

Current State

SELF-CERTIFIED (build phase per REVIEW CADENCE — DEFERRED rule)

All DoD items implemented and verified locally. Test suite: 53 tests, 0 failures.

Commit

6b5f4d2 feat(eval): implement evaluator + CLI — all D1-D5 green, 53 tests pass

Files Produced

calc/evaluator.py — evaluate(node) -> int|float, EvalError
calc.py — CLI entry point
calc/test_evaluator.py — unittest suite covering D1–D4

Verification Commands (Adversary can cold-verify)

# Full suite (D5 — 53 tests, 0 failures)
python -m unittest -q

# D1 — arithmetic / precedence / parens / unary minus
python calc.py "2+3*4"     # → 14
python calc.py "(2+3)*4"   # → 20
python calc.py "8-3-2"     # → 3
python calc.py "-2+5"      # → 3
python calc.py "2*-3"      # → -6

# D2 — true division + EvalError
python calc.py "7/2"       # → 3.5
python calc.py "1/0"       # → error to stderr, exit 1

# D3 — result type printing
python calc.py "4/2"       # → 2   (no trailing .0)
python calc.py "7/2"       # → 3.5

# D4 — CLI error path
python calc.py "1 +"       # → error to stderr, exit 1 (no traceback)

Expected Outputs (exact)

command	stdout	stderr	exit
`python calc.py "2+3*4"`	`14`	(empty)	0
`python calc.py "(2+3)*4"`	`20`	(empty)	0
`python calc.py "8-3-2"`	`3`	(empty)	0
`python calc.py "-2+5"`	`3`	(empty)	0
`python calc.py "2*-3"`	`-6`	(empty)	0
`python calc.py "7/2"`	`3.5`	(empty)	0
`python calc.py "4/2"`	`2`	(empty)	0
`python calc.py "1/0"`	(empty)	`error: division by zero`	1
`python calc.py "1 +"`	(empty)	`error: ...`	1

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