feat: modernization phase 5 PR3

[dsmurfin]

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[Copilot]

Pull request overview

This PR (Modernization Phase 5 PR3) expands the receiver/merger “merge surface” so consumers can observe priority-related merge state (universe priority and per-address priority activity) in addition to merged levels, while also fixing a newly-reachable universe-priority dedupe bug in sACNMerger.

Changes:

• Surface winning per-slot priorities, whether PAP is active, and the winning universe priority on sACNReceiverMergedData.
• Extend sACNReceiver.information(for:) to include per-source priority state, and emit/forward a .perAddressPriorityLost event from sACNReceiver and sACNReceiverGroup.
• Fix sACNMerger.updateUniversePriorityForSource dedupe logic and add regression tests to pin the behavior.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Tests/sACNKitTests/ReceiverTests.swift	Adds receiver-level tests for surfaced priority fields and PAP-loss event behavior.
Tests/sACNKitTests/MergerTests.swift	Adds a regression test to ensure universe-priority decreases trigger a re-merge.
Sources/sACNKit/Receiver/sACNReceiverGroup.swift	Adds and forwards a new group event for per-address-priority loss.
Sources/sACNKit/Receiver/sACNReceiver.swift	Enables merger output tracking, enriches information(for:), emits PAP-loss events, and includes priority fields in merged payloads.
Sources/sACNKit/Receiver/Delegate/sACNReceiverSource.swift	Adds per-source priority state fields to the receiver source info payload.
Sources/sACNKit/Receiver/Delegate/sACNReceiverMergedData.swift	Adds merged priority-related fields (per-slot priorities, PAP active flag, universe priority).
Sources/sACNKit/Merger/sACNMerger.swift	Exposes internal read of winning per-slot priorities and fixes universe-priority dedupe logic.
docs/modernization/phase-5.md	Documents PR3’s delivery note and the uncovered/fixed guard bug.

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