# 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)

```bash
# 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 |

## DONE