Stand up the Engine/PIP surface for MAT-WP-0001

Declare layer.yaml, add a Python engine over a local SQLite store,
and cover deterministic assessment, the §13 gap register, stance-map
inventory, claim guardrails, and the gate-house review path with tests.

Assistant: grok
Assistant-Session: 01a04ceb-150e-7e80-a542-ec8b1372e164

src/maturity_engine/__init__.py

@@ -0,0 +1,21 @@
+"""Deterministic maturity assessment, gap register, and capability readiness."""
+
+from maturity_engine.claims import Claim
+from maturity_engine.engine import Engine
+from maturity_engine.errors import GuardrailError, ModelError, UnevaluableCriterion
+from maturity_engine.models import Assessment, Criterion, Evidence, Gap, Ladder, Level, StanceMap
+
+__all__ = [
+    "Assessment",
+    "Claim",
+    "Criterion",
+    "Engine",
+    "Evidence",
+    "Gap",
+    "GuardrailError",
+    "Ladder",
+    "Level",
+    "ModelError",
+    "StanceMap",
+    "UnevaluableCriterion",
+]