PR #30136 review caught: three `s6-setuidgid hermes sh -c "..."`
invocations in stage2-hook.sh interpolated $HERMES_HOME into a
nested shell context. Practically low-risk (a malicious HERMES_HOME
already requires container-launch privileges) but the cleaner
pattern is to invoke commands directly so the shell isn't a second
interpreter.
* `mkdir -p` of the data subdirs now runs directly via s6-setuidgid,
one path per arg.
* The .install_method stamp is written via `printf | tee` — also no
shell wrapper.
* The skills_sync invocation uses the venv's python by absolute path
instead of sourcing activate inside a shell. skills_sync.py doesn't
need anything from activate beyond sys.path, which the bin-stub
python already provides.
No behavior change. Just a smaller attack surface and a script
that's easier to read.
9914bfc594