Only main can answer whether a loopback address is reachable: it holds
the live SSH connection and the profile precedence that picks it. The
renderer asks over IPC instead of guessing.
Forwards are scoped to the connection that authorized them and dropped
whenever it changes, so a new host never inherits a tunnel into the old
one. A failed forward logs and returns the original URL rather than
breaking the load path.
Brooklyn Nicholson
956642c4fc