Complete PolygonMesh, PolyfaceMesh and Mesh host model coverage

Maps all three mesh kinds with host validation of grid counts, face indices
and edge topology, and skips sub-record common data in the generator.
A shared run_mesh_lifecycle driver passes the full gate for each kind,
including DWG and DXF reopen with re-edit.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

plugins/opencad-python/README.md

@@ -94,7 +94,7 @@ The host-owned catalog classifies all 48 entity variants and tracks every
 traced field, including fields marked `unmapped`. Query it with
 `doc.coverage()` or `doc.coverage("Line")`; each row includes source field,
 type, access, and current validation status. Geometry edits remain limited to
-the 27 mapped kinds.
+the 30 mapped kinds.
 For any entity, `entity.snapshot` returns a detached dictionary of its raw
 CAD fields, including `snapshot["common"]` and kind-specific nested values.
 It can inspect an unmapped kind; editing the dictionary does

plugins/opencad-python/build/generate.rs

@@ -218,7 +218,9 @@ fn helper_closure(manifest: &Manifest, registry: &TypeRegistry) -> Vec<String> {
             panic!("entity_manifest.json: type {name} (reached transitively) is not in the type registry");
         };
         for f in &info.fields {
-            queue.push(f.type_id.as_str().to_string());
+            if f.type_id.as_str() != "EntityCommon" {
+                queue.push(f.type_id.as_str().to_string());
+            }
         }
         for v in &info.variants {
             for f in &v.fields {
@@ -666,6 +668,14 @@ fn gen_struct(name: &str, info: &TypeInfo, registry: &TypeRegistry) -> String {
     let mut from_dict_fields = String::new();
     let mut default_fields = String::new();
     for f in &info.fields {
+        if f.type_id.as_str() == "EntityCommon" {
+            // A sub-record's own common data (layer, XDATA, handles) is not part
+            // of the scripted model; it defaults on the way in.
+            let default = "acadrust::entities::EntityCommon::default()";
+            from_dict_fields.push_str(&format!("        {}: {default},\n", f.name));
+            default_fields.push_str(&format!("        {}: {default},\n", f.name));
+            continue;
+        }
         let getter = getter_for_field(
             registry,
             f.type_id.as_str(),

plugins/opencad-python/entity_manifest.json

@@ -26,7 +26,10 @@
     "MLine",
     "Dimension",
     "MultiLeader",
-    "Table"
+    "Table",
+    "PolygonMesh",
+    "PolyfaceMesh",
+    "Mesh"
   ],
   "manual_kinds": ["Dimension"],
   "base_fields": ["handle", "layer", "owner_handle"],
@@ -310,6 +313,24 @@
         "legacy_border_line_weights": { "exclude": true },
         "legacy_border_visibility": { "exclude": true }
       }
+    },
+    "PolygonMesh": {
+      "rust_constructor": "acadrust::entities::PolygonMeshEntity::default()",
+      "fields": { "vertices": { "required": true } }
+    },
+    "PolyfaceMesh": {
+      "fields": {
+        "vertices": { "required": true },
+        "faces": { "required": true },
+        "seqend_handle": { "read_only": true }
+      }
+    },
+    "Mesh": {
+      "fields": {
+        "vertices": { "required": true },
+        "faces": { "required": true },
+        "version": { "read_only": true }
+      }
     }
   }
 }

plugins/opencad-python/src/ocs_module.rs

@@ -4756,7 +4756,7 @@ mod tests {
                 );
             }
         }
-        assert_eq!(emitted.len(), 27);
+        assert_eq!(emitted.len(), 30);
     }
 
     #[cfg(feature = "experimental-host-model")]