SessionStart message routing โ€” CLAUDE_PLUGIN_ROOT channel fix

ork's sync-session-dispatcher injects the absolute plugin root so the model can Read plugin files (its Bash env has no CLAUDE_PLUGIN_ROOT). The bug: it rode the user-facing banner channel. The fix routes it to the model-facing channel. Toggle to see it.

SessionStart ยท startup
systemMessage
USER-facing โ†’ shown as "says:" banner
additionalContext
MODEL-facing โ†’ injected, no banner
user banner (you see it) model context (you don't) โŒจ dashed = the CLAUDE_PLUGIN_ROOT payload