oc-bench start: no Incus/LXC support for gateway execution

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Bug

oc-bench start starts the OpenClaw gateway by running openclaw gateway run either locally (host binary) or via docker exec. There is no Incus/LXC path.

When the pinned OpenClaw version lives inside an Incus container (e.g. oc-stack has 2026.4.27 but the host has 2026.4.26), the version check in check_openclaw_version fails immediately:

openclaw_version=fail OpenClaw 2026.4.26 does not match pinned version 2026.4.27

Root cause

_openclaw_cmd in openclaw_bench/preflight.py:674 only handles two cases:

def _openclaw_cmd(container: str | None = None) -> list[str]:
    if not container:
        return ["openclaw"]
    return ["docker", "exec", container, "openclaw"]

Incus containers are not supported. The --openclaw-container CLI flag is wired through but assumes Docker.

Expected

oc-bench start --oc-runtime incus:oc-stack (or equivalent) should execute openclaw commands via incus exec oc-stack -- so the pinned version inside the container is used.

Related

• _openclaw_cmd in openclaw_bench/preflight.py:674
• _gateway_start_cmd in openclaw_bench/preflight.py:710
• check_openclaw_version in openclaw_bench/preflight.py:399
• Issue scan_existing_oc_profiles cannot read profiles inside containers (LXC/Docker) #9 — same pattern: the profile scanner also lacks Incus support. Both gaps should be fixed with the same --oc-runtime incus:<instance> flag wired through to all OpenClaw CLI invocations.

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Codex triage: category=bug. Impact=oc-bench start cannot run against a pinned OpenClaw install inside Incus/LXC; version check fails on host binary and prevents gateway bringup. Suspected area=openclaw_bench/preflight.py _openclaw_cmd/_gateway_start_cmd only handling host + docker exec. Next action=extend OpenClaw command construction to honor --oc-runtime incus:<instance> by using incus exec <instance> -- openclaw (and keep Docker/host paths intact); align with issue #9 so all OpenClaw CLI invocations become runtime-aware.