Root cause of the plugin not loading was a symlink
~/.openclaw/extensions/openclaw-multi-session-plugins -> /tmp/... (ephemeral).
Replaced with a real dir, registered via `openclaw plugins install --force`,
restarted the gateway: now boots with "6 plugins ... openclaw-multi-session-plugins"
from the stable path, provenance warning gone, and xworkmate.session.prepare returns
the real plugin mapping (no bridge fallback). Survives restart.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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