Two independent desktop-boot/runtime bugs found driving the app over CDP
against current main, each pinned by a regression test:
1) Adapter no-op notify loop: IncrementalExternalStoreThreadRuntimeCore.
__internal_setAdapter's fast path (same isRunning + same messageRepository)
called _notifySubscribers() unconditionally. ChatRuntimeBoundary passes a
fresh adapter literal every render, so any subscriber whose notification
re-renders the boundary loops render->setAdapter->notify->render until
React kills the tile with 'Maximum update depth exceeded' (reproduced live
on every bot-profile switch; session tile dies behind its error boundary).
Now the fast path notifies only when extras/suggestions/capabilities
actually changed.
2) Dual-venv interpreter mismatch: findPythonForRoot() prefers .venv over
venv, but createPythonBackend() hardcoded venvRoot=root/venv for
PYTHONPATH. A checkout with BOTH venvs (dev .venv 3.12 + install venv
3.11) got a 3.12 interpreter with 3.11-compiled native wheels on
PYTHONPATH and died on the first import (pydantic_core) before the
gateway bound - the renderer then showed 'Gateway offline' on every
profile. venvRootForPython() now maps the selected interpreter back to
ITS venv; root/venv remains the fallback for system pythons only.
