IMenuProvider: declarative menu placement with optional context awareness.
C++ interface with pybind11 bindings + GIL-safe holder. SDKMenuManipulator
(shared WorkbenchManipulator) injects menu items on workbench switch,
filtered by editing context when context_ids() is non-empty.
register_command(): thin Python wrapper around FreeCADGui.addCommand()
that standardizes the calling convention within the SDK contract.
Python wrappers (kindred_sdk.register_menu, kindred_sdk.register_command)
use kcsdk-first routing with FreeCADGui fallback.
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