v1.2.0

Adds production-grade engineering features and tools: 2D GD&T (feature control frames + datum features) via engineering/gdt.py, ISO‑129 dimension tolerance support (engineering/tolerances.py) and an ezdxf/COM plumbing for toleranced dims, a scalar drawing score + invalidity ratio (engineering/scoring.py) wired into drawing_finalize, in-place entity editors (entity_edit_text/entity_edit_geometry), and a friendly drawing_settings facade. Includes server tool wiring, COM/ezdxf backend implementations, datum-consistency critique, many unit tests, README/CLAUDE/CHANGELOG updates, and a version bump to 1.2.0. Also corrects COM backend capability label (entities_2d).

tests/test_scoring.py

@@ -0,0 +1,71 @@
+"""Tests for the scalar drawing-score / invalidity-ratio (engineering/scoring.py)
+and its wiring into drawing_finalize."""
+
+from __future__ import annotations
+
+import pytest
+
+from engineering.scoring import combine, score_findings
+
+pytestmark = pytest.mark.asyncio
+
+
+async def test_clean_drawing_scores_100():
+    s = score_findings(0, 0, 0)
+    assert s["score"] == 100.0
+    assert s["invalidity_ratio"] == 0.0
+    assert s["grade"] == "A"
+
+
+async def test_errors_dominate_penalty():
+    err = score_findings(1, 0, 0)["score"]
+    warn = score_findings(0, 1, 0)["score"]
+    info = score_findings(0, 0, 1)["score"]
+    assert err < warn < info < 100.0
+
+
+async def test_score_clamped_to_zero():
+    s = score_findings(100, 100, 100)
+    assert s["score"] == 0.0
+    assert s["grade"] == "F"
+
+
+async def test_invalidity_ratio_is_error_fraction():
+    s = score_findings(1, 3, 0)  # 1 of 4 findings is a hard error
+    assert s["invalidity_ratio"] == 0.25
+
+
+async def test_combine_sums_summaries():
+    a = {"error": 1, "warning": 0, "info": 0}
+    b = {"error": 0, "warning": 2, "info": 1}
+    combined = combine(a, b)
+    assert combined["errors"] == 1
+    assert combined["warnings"] == 2
+    assert combined["info"] == 1
+
+
+# ── finalize wiring ─────────────────────────────────────────────────────────
+
+
+class _FakeCtx:
+    def __init__(self, backend):
+        self.lifespan_context = {"backend": backend}
+
+    async def warning(self, message):
+        pass
+
+
+async def test_finalize_payload_carries_score(backend, tmp_path):
+    import server
+
+    await backend.drawing_apply_iso_layers("mech")
+    await backend.entity_create_line(0, 0, 100, 0, layer="GEOMETRY")
+    ctx = _FakeCtx(backend)
+    payload = await server.drawing_finalize(
+        save_path=str(tmp_path / "part.dxf"),
+        ctx=ctx,
+    )
+    assert "score" in payload
+    assert 0.0 <= payload["score"]["score"] <= 100.0
+    assert "invalidity_ratio" in payload["score"]
+    assert payload["score"]["grade"] in ("A", "B", "C", "D", "F")