* MessagingClient.new: return a Result via a new newMessagingClient
factory instead of quit(QuitFailure) on a recoverable SendService
failure; no longer aborts the FFI host (restores master's behaviour).
Callers (facade, FFI mount, tests) updated to the factory.
* LogosDelivery.stop(): best-effort run-to-completion; stop and nil every
component even if a prior one fails, aggregating errors (was: early
return that leaked the messaging client and the node).
* LogosDelivery.getNodeInfo(): nil-guard self.waku like the sibling
getters (was: nil-deref before start / after stop).
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