Add tool.Parametric registry and lifecycle mixins

Establish a single source of truth for parametric element types (door,
window, stair, railing, roof). tool.Parametric.EDIT_TYPES drives:
- BIM<Name>Properties PointerProperty attachment via the registry
- GizmoPreferences<Name> class registration in bim/__init__.py
- save-time auto-commit of pending draft edits
- the refresh_post_commit epilogue called from IfcStore after every IFC
  mutation, which fixes the stale-header bug where in-place hotkey
  mutations (S_E / C_E) left BIMModelProperties and the gizmo cache
  pointing at obsolete values.

Refactors door/window/railing/roof onto shared mixins from
bim/parametric_lifecycle.py (FeatureModifierEditMixin and
PathPreservingEditMixin); stair gets the lock-gizmo refactor and
frame-cache integration. Behavior preserved.

Adds BaseParametricGizmoGroup._prime_frame_caches so the parametric
gizmos stop re-deriving preferences, view direction, and billboard
rotation per frame; reorders poll() to short-circuit on the cheapest
predicate first. Adds the icon library + BillboardingGizmoGroupMixin
that the wall feature in the next commit will consume.

Generated with the assistance of an AI coding tool.

src/bonsai/test/bim/test_parametric_registry.py

@@ -0,0 +1,115 @@
+# Bonsai - OpenBIM Blender Add-on
+# Copyright (C) 2026
+#
+# This file is part of Bonsai.
+#
+# Bonsai is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Bonsai is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Bonsai.  If not, see <http://www.gnu.org/licenses/>.
+#
+# This file was generated with the assistance of an AI coding tool.
+
+"""Registration smoke test for :attr:`tool.Parametric.EDIT_TYPES`.
+
+The registry is the single source of truth for which parametric element types
+exist. Every consumer (auto-commit on save, finish/cancel chains, the
+``PointerProperty`` attachment, the ``GizmoPreferences<X>`` registration) derives
+identifiers from each entry's short ``name`` token. Forget any downstream
+registration and the silent-desync the framework exists to prevent will ship.
+
+These tests pin the registry-to-runtime contract: for every entry the operator
+``bl_idname``s resolve to registered ``bpy.ops.bim.*`` callables, the
+``PropertyGroup`` class is attached to ``bpy.types.Object``, and the per-type
+predicate exists on :class:`tool.Blender.Modifier`."""
+
+import types
+
+import bpy
+import pytest
+
+pytestmark = pytest.mark.model
+
+
+@pytest.fixture(autouse=True)
+def _require_real_bpy():
+    if not isinstance(bpy, types.ModuleType) or hasattr(bpy, "_mock_name"):
+        pytest.skip("requires real Blender (bpy is mocked or absent)")
+
+
+@pytest.fixture
+def registry():
+    from bonsai import tool
+
+    return tool.Parametric.EDIT_TYPES
+
+
+def test_registry_is_non_empty(registry):
+    assert len(registry) >= 1
+
+
+def test_every_entry_has_enable_op_registered(registry):
+    missing = [e.enable_op for e in registry if not hasattr(bpy.ops.bim, e.enable_op.removeprefix("bim."))]
+    assert not missing, f"Missing enable operators: {missing}"
+
+
+def test_every_entry_has_finish_op_registered(registry):
+    missing = [e.finish_op for e in registry if not hasattr(bpy.ops.bim, e.finish_op.removeprefix("bim."))]
+    assert not missing, f"Missing finish operators: {missing}"
+
+
+def test_every_entry_has_cancel_op_registered(registry):
+    missing = [e.cancel_op for e in registry if not hasattr(bpy.ops.bim, e.cancel_op.removeprefix("bim."))]
+    assert not missing, f"Missing cancel operators: {missing}"
+
+
+def test_every_entry_has_property_group_attached(registry):
+    # ``register_object_properties`` runs at addon enable; if any entry's
+    # PropertyGroup class is missing on prop module the attribute is skipped.
+    missing = [e.props_attr for e in registry if not hasattr(bpy.types.Object, e.props_attr)]
+    assert not missing, (
+        f"bpy.types.Object missing attributes: {missing} — "
+        f"verify the matching PropertyGroup classes exist in bim.module.model.prop"
+    )
+
+
+def test_every_entry_has_modifier_predicate(registry):
+    from bonsai import tool
+
+    missing = [e.name for e in registry if getattr(tool.Blender.Modifier, f"is_{e.name}", None) is None]
+    assert not missing, f"tool.Blender.Modifier missing is_<name> predicates: {missing}"
+
+
+def test_gizmo_preferences_attached_when_class_exists(registry):
+    """For every registry entry whose ``GizmoPreferences<Name>`` class exists in
+    ``bonsai.bim.ui``, the matching sub-PointerProperty must be attached to
+    ``ui.GizmoPreferences`` under the registry entry's ``name`` token.
+
+    Catches the silent-skip behaviour of
+    ``Parametric.iter_gizmo_preference_classes``: a typo in the class name
+    or a dropped registration would otherwise produce a missing sub-panel at
+    runtime with no error. Entries without a ``GizmoPreferences<Name>``
+    class are allowed — not every parametric type ships gizmo prefs."""
+    from bonsai.bim import ui
+
+    missing = []
+    for feature in registry:
+        prefs_class_name = f"GizmoPreferences{feature.name.capitalize()}"
+        if not hasattr(ui, prefs_class_name):
+            continue
+        if not hasattr(ui.GizmoPreferences, feature.name):
+            missing.append((feature.name, prefs_class_name))
+    assert not missing, (
+        f"ui.GizmoPreferences missing sub-PointerProperty field(s) for: {missing} — "
+        f"each registered ``GizmoPreferences<Name>`` class must have a matching "
+        f"``<name>: PointerProperty(type=GizmoPreferences<Name>)`` field on "
+        f"``ui.GizmoPreferences``"
+    )