When 'hermes update' rebuilds the project venv (rmtree + uv venv on the
first managed-uv migration), the desktop-rebuild and profile-skills-sync
steps that follow both spawn sys.executable. Firing while the venv is
mid-rewrite makes the child interpreter abort with the bare stderr line
'No pyvenv.cfg file', surfacing as a spurious 'Desktop build failed' /
'default: sync failed' on an update that actually succeeded.
Add _wait_for_interpreter_venv_ready(): resolve the venv hosting
sys.executable and poll briefly for pyvenv.cfg to (re)appear before each
of those subprocess steps. No-op when the interpreter isn't venv-hosted.
The desktop rebuild also retries once after re-waiting, and keeps
streaming its output live (no capture). Best-effort throughout — callers
proceed regardless, so a genuinely broken venv still surfaces the real
error.
Teknium
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