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xarmian
b7ae022b6f
Subscribe allocated and raised a gap channel its callers could not read, which round 5 called dead work. The read is right and the disposition is the other one: an interface method whose subscribers CANNOT be told they missed something is a silent under-delivery waiting for its first production caller, and internal/watchevents' Subscribe already returns the signal, so the asymmetry was the defect rather than the allocation. Subscribe now returns it too, on all three implementations. No production caller changes — the handlers use SubscribeIfAllowed and SubscribeAndReplaySince — so this is a test-call-site sweep plus one signature.