Nanobot.run() previously mutated the shared self._loop._extra_hooks
attribute under a try/finally. When two run() calls with different
session_keys execute concurrently, they overwrite each other's hook
lists — the second call saves the first call's hooks as 'prev', and
the finally block restores stale state.
Use a contextvars.ContextVar instead, which is per-task in asyncio.
This gives each concurrent run() call its own hook list without
changing any function signatures. Falls back to self._extra_hooks
when no per-call hooks are set (non-SDK usage).
michaelxer
0bb1b0b3c2