The SDK client disables fetch timeout (req.timeout = false). When the
opencode server is slow or unresponsive, client.session.status() hangs
forever, blocking the entire dispatchToHooks chain (sequential await)
and deadlocking the plugin.
Add a 5s timeout wrapper around the status call in isSessionActive().
On timeout, the catch block returns false (treat as inactive), letting
the caller proceed instead of hanging indefinitely.
The timeout parameter is exposed for testing to avoid 5s test delays.
Refs: .debugging/status-timeout-hang.md
YeonGyu-Kim
36468b118d