The opt-in glibc-static supervisor variant from #2682 is gone: the Nix
release builds (#2977) removed it from CI and the supervisor Dockerfile,
and the RFC 0012 sandbox split (#2942) removed it from the staging script.
The split also moved the binary that runs inside workload images to
openshell-sandbox; the supervisor now runs from its own image and is
dynamically linked. A few places still describe the old model:
- skills/debug-openshell-cluster told operators to check that
supervisor_image contains a static /openshell-supervisor. Ask instead for
a supervisor from the matching release whose loader and shared libraries
are available inside that image, and give a `--version` check that shows
both. The static requirement for /openshell-sandbox is unchanged.
- verify-static-binary.sh justified its check with the supervisor and the
glibc-static variant. Describe the property it enforces instead, with
the musl sandbox runtime as the main example.
- stage-prebuilt-binaries.sh kept an unreachable gnu-static case in
target_triple.
No behavior change: resolve_component only ever selects gnu or musl.
Signed-off-by: Emilien Macchi <emacchi@redhat.com>