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* tests: add SMP proxy relay reconnection tests Reproduces the proxy failing to reconnect to a destination relay when the sender disconnects mid-connection (empty session var left in smpClients). * fix: bracket session var creation to drop it on interrupt getSessVar inserts an empty session var that the connect path then fills with putTMVar. If the connecting thread is killed by an async exception before that fill (a proxy worker on client disconnect, an agent worker on cancel), the empty var was left in the map forever and every later request for that server blocked on it until timing out (permanent PCEResponseTimeout). Wrap get-or-create with withGetSessVar (bracketOnError) at the call sites, so the cleanup is established where the var is created and covers the whole connect: on interrupt before fill the still-empty var is dropped and the next request reconnects. This closes the window between getSessVar and the fill that a handler installed inside the connect function cannot cover. * test: cover session var leak on interrupted connect UtilTests: tryAllErrors rethrows ThreadKilled/StackOverflow (the mechanism that skips putTMVar). SMPProxyTests: agent client reconnection after a cancelled connect, plus a control proving the stalling relay alone does not cause the failure; refine the relay reconnection tests. * refactor --------- Co-authored-by: Evgeny Poberezkin <evgeny@poberezkin.com>