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5f98524e02
Replace the mutex-guarded callback model of peer.Conn with a per-peer event loop that exclusively owns all mutable connection state. External callers and transport workers post typed events into a non-blocking, coalescing mailbox instead of contending on conn.mu: - offers/answers coalesce to the newest message, a new offer flushes queued candidates of the superseded session - candidates are applied in arrival order from a bounded FIFO - transport state changes are never dropped - the blocking relay dial runs on a helper goroutine with a single dial in flight; signaling I/O (offer/answer sends) runs off the loop conn.mu now only guards the open/close lifecycle. Close posts a close event and waits for the loop teardown; the loop also tears down on engine context cancellation and releases resources of unprocessed events. Delete the Handshaker listener machinery (Listen loop, unbuffered drop-on-busy channels, AsyncOfferListener with its double-processing of the first offer), the never-wired dispatcher package and the unused ICEMonitor.ReconnectCh. Fix a goroutine leak in the WG watcher test that raced with tests mutating the package-level check timing vars.