fb4eaa59ee
The `_inner` wrapper existed only to set and reset the multiplex contextvar around the whole launch. Every consumer of that context (the payload flag, `hydrate_profile_secret_sources`, `strip_launch_profile_env`, the scrubbed `build_subprocess_env`) runs before the worker is spawned, so the span now covers exactly the handoff-environment build and ends before `Popen` and the acknowledgement wait. One function, one try/finally, same behaviour.