connect() called _register_slash_commands inline on every (re)connect, and
/reload-skills called refresh_skill_group inline; both run
discord_skill_commands_by_category, the same per-skill path-resolution walk
the Telegram menu paid in #110707. On a 1.5k-skill install that holds the
loop past the liveness watchdog. Registration now hops through
asyncio.to_thread from connect(); refresh_skill_group is a coroutine that
hops the rescan the same way (the reload handler already awaits an awaitable
result). Contextvar-scoped profile overrides propagate through to_thread.
One invariant test: the loop keeps ticking while the scan blocks, from both
sites. Red on the PR head, green here.
Review finding: Discord _register_slash_commands/refresh_skill_group ran the skill catalog disk scan synchronously on the event loop.
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