Free the `Orchestrator` name for the incoming host-side control-plane service
ABC (parallel to `Gateway`). The in-guest control-plane core (registry + broker,
in orchestrator/service.py) becomes `OrchestratorCore`; server.py, __main__.py,
the lazy facade, and the two service/server tests updated.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
orchestrator/supervisor/ held only __init__.py, so the package no longer
earns its own directory. Moved it to orchestrator/supervisor.py and
removed the dir. External imports are unchanged (orchestrator.supervisor
resolves identically as a module); only the file's own relative-import
depths shift up one level. Full unit suite green (2243).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
didericis