修改agent流程，分步构建cdsl

backend/engine/cdsl_engine/runtime.py

@@ -483,9 +483,13 @@ def _execute_hole(node: FeaturePlanNode, session: ExecutionSession, *, wizard: b
         positions_are_local = False
     # 3. 解析孔规格 HoleSpec（直径、深度、类型等，wizard 模式提供额外默认值）。
     spec = HoleSpec.from_feature(node.atomic_id, node.params, wizard=wizard)
-    # 4. 确定孔轴向：默认沿宿主面法向，但需保证指向主体内部（按主体中心与面原点的相对位置取反）。
-    normal = host.normal
-    inward = normal if vector_dot(vector_subtract(session.adapter.body_center(session.body), host.origin_mm), normal) >= 0 else vector_scale(normal, -1)
+    # 4. A host-face normal is an outward B-rep orientation, so its inverse
+    # always enters the material.  Inferring direction from the global body
+    # centre fails for concave or multi-leg parts: for example, the top face
+    # of an L bracket can sit below the whole body's centre and the old rule
+    # drilled outward, producing a no-op feature reported as successful.
+    # The selected topology face is the local, authoritative orientation.
+    inward = vector_scale(host.normal, -1)
     # 5. 生成孔切除工具：按孔规格、起始位置、内方向及“贯穿到主体底面”的深度构造工具实体。
     tool = session.adapter.hole_tool(
         spec,
@@ -895,6 +899,7 @@ def rebuild_cdsl(cdsl: dict[str, Any], out_step: Path, *, strict: bool = True) -
         "out_step": str(out_step),
         "volume_mm3": float(geometry["volume_mm3"]),
         "bbox_mm": {"min": bbox[:3], "max": bbox[3:]},
+        "solid_count": int(geometry.get("solid_count") or 0),
         "feature_results": [result.as_dict() for result in session.results.values()],
         "runtime_diagnostics": [diagnostic.as_dict() for diagnostic in diagnostics],
         "topology_records": [record.public_dict() for record in session.topology.records()],