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🐛 Stop the notice watcher from stealing the provider health signal - #605
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The delivery notice watcher and the app's health publisher both received from one single-slot channel, so whichever woke first consumed the signal and the other never saw a provider health change. /health could then miss a degraded provider until the next change, and TestProviderHealthIsPublishedWithoutFailingReadiness flaked. Each consumer now has its own channel, with a regression test.