Expose AssemblyObject::getSolveContext() to Python and hook into the
.kc save flow so that silo/solver/context.json is packed into every
assembly archive. This lets server-side solver runners operate on
pre-extracted constraint graphs without a full FreeCAD installation.
Changes:
- Add public getSolveContext() to AssemblyObject (C++ and Python)
- Build Python dict via CPython C API matching kcsolve.SolveContext.to_dict()
- Register _solver_context_hook in kc_format.py pre-reinject hooks
- Add silo/solver/context.json to silo_tree.py _KNOWN_ENTRIES
Add document tree infrastructure that creates Silo metadata nodes when
a .kc file is opened. Nodes appear under a "Silo" group and represent
the silo/ ZIP directory entries (manifest, metadata, history, etc.).
New files:
- silo_objects.py: SiloViewerObject proxy with Transient properties
- silo_viewproviders.py: SiloViewerViewProvider with icon stubs
- silo_tree.py: SiloTreeBuilder with conditional node creation
- silo_document.py: SiloDocumentObserver singleton + registration
Modified files:
- kc_format.py: pre_reinject hook system for silo/ entry mutation
- InitGui.py: 600ms timer registration for document observer
- CMakeLists.txt: install list for 4 new Python files
Closes#37
