62556c245a
The pass-through NullDriverCapabilityInvoker returns the call-site task directly, so it never exercises the real invoker's internal `pipeline.ExecuteAsync(...).ConfigureAwait(false)`. Adds a test-only Core reference to Runtime.Tests (the PRODUCTION Runtime assembly stays Polly-free via the seam) and a discovery test that drives DriverInstanceActor through a real CapabilityInvoker over a genuinely-yielding ITagDiscovery driver — proving the invoker's internal ConfigureAwait(false) does NOT leak to the actor's own await, so the post-await Context.Parent.Tell still runs (DiscoveredNodesReady arrives). Runtime.Tests 358, Core.Tests 238.