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The rebase carried #6664's WGWatcher changes into our wg_watcher package (single-shot, no enabled flag). Adapt conn.go to match: create a fresh watcher per connection attempt in enableWgWatcherIfNeeded, drop it in disableWgWatcherIfNeeded, nil-guard resetEndpoint. Guard stale WG timeouts on the event loop instead of #6664's conn.mu recheck: onWGDisconnected only checked watcherCtx on the watcher goroutine, racing the loop that cancels it and processes the timeout. A loop-owned wgWatcherGen tags evWGTimeout; handleWGTimeout drops events from a superseded generation, so the check and the teardown happen atomically on the single loop.