feat: modernization phase 4 PR4 B

[dsmurfin]

No description provided.

[Copilot]

Pull request overview

Modernization Phase 4 PR4(B): completes the receiver-vertical migration to Swift Concurrency by converting sACNReceiverRaw, sACNReceiver, and sACNReceiverGroup from GCD+delegates to actor types with AsyncStream-based outputs, aligning receiver behavior with the already-modernized source/discovery components and the Phase 4 runtime/isolation model.

Changes:

• Replaces receiver delegate APIs with AsyncStream (data/events/debugLog) and introduces a synchronous on-event-loop RawReceiverSink for raw-to-merged delivery without Task hops.
• Refactors raw receiver lifecycle/timers to LifecycleGate + NIO scheduled tasks, and updates group orchestration to async fan-in via per-child drain tasks.
• Migrates receiver-related test suites and public docs (README/DocC/modernization notes/AGENTS/rules) to the new async/stream model; removes now-dead delegate protocol files.

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
Tests/sACNKitTests/TestSupport.swift	Adds StreamCollector to drain AsyncStream outputs for assertions in async tests.
Tests/sACNKitTests/ReceiverTests.swift	Migrates merged receiver tests from delegates/semaphores to stream-based collection and async APIs.
Tests/sACNKitTests/ReceiverRawTests.swift	Migrates raw receiver characterization to stream-based collection; adds gated socket-binding regression suite.
Tests/sACNKitTests/ReceiverGroupTests.swift	Migrates group tests to actor/stream APIs; adds regression for samplingStarted-on-add and reentrancy via consumers.
Tests/sACNKitTests/LoopbackTests.swift	Updates end-to-end loopback tests to observe via streams; adds new receiver-group and stop-race coverage.
Sources/sACNKit/Shared/sACNComponent.swift	Deletes obsolete delegate protocols previously used by the receiver stack.
Sources/sACNKit/Receiver/sACNReceiverRaw.swift	Converts raw receiver to an actor on sACNRuntime; replaces delegates with streams; moves timers to NIO scheduled tasks; adds RawReceiverSink.
Sources/sACNKit/Receiver/sACNReceiverGroup.swift	Converts group to an actor; replaces delegates with streams; implements child fan-in via drain tasks and serializes structural mutations.
Sources/sACNKit/Receiver/sACNReceiver.swift	Converts merged receiver to an actor; connects raw output via RawReceiverSink; replaces delegates with streams and async lifecycle.
Sources/sACNKit/Receiver/Delegate/sACNReceiverRawDelegate.swift	Removes obsolete raw receiver delegate protocol.
Sources/sACNKit/Receiver/Delegate/sACNReceiverGroupDelegate.swift	Removes obsolete group delegate protocol.
Sources/sACNKit/Receiver/Delegate/sACNReceiverDelegate.swift	Removes obsolete merged receiver delegate protocol.
Sources/sACNKit/Documentation.docc/sACNKit.md	Updates library overview to reflect actor + stream delivery across all components.
README.md	Updates “Receiving” examples/notes to the new async/streams receiver APIs.
docs/modernization/phase-4.md	Updates Phase 4 status and buffering/timer details for the receiver vertical migration.
AGENTS.md	Updates repository architecture/concurrency guidance to reflect receiver actors and removed delegates.
.claude/rules/timing.md	Updates timing rule references to the new receiver timer implementation names/mechanism.
.claude/rules/threading.md	Updates concurrency contract to actor/runtime model (and removes the old GCD/delegate guidance).

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