[WIP] Prototype pulling LiveObjects plugin into this repo

.github/workflows/check-liveobjects.yaml

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+# Check workflow for the AblyLiveObjects library product. Adapted from the
+# former ably-liveobjects-swift-plugin repo's check.yaml. SPM-based and
+# xcodebuild-based jobs are wired up. The remaining jobs from the
+# original (lint, documentation, code coverage, example app,
+# generate-matrices) still need follow-up work; see commit
+# 7ab9a1e for the full inventory.
+
+name: Check LiveObjects
+
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  liveobjects-build-and-test-spm:
+    name: SPM (Xcode ${{ matrix.xcode-version }})
+    runs-on: macos-15
+    strategy:
+      fail-fast: false
+      matrix:
+        xcode-version: ['16.4']
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: ${{ matrix.xcode-version }}
+
+      - name: Build the AblyLiveObjects library
+        run: swift build --target AblyLiveObjects
+
+      - name: Run AblyLiveObjects unit tests
+        run: swift run LiveObjectsBuildTool test-library --platform macOS --only-unit-tests
+
+  liveobjects-build-release-configuration-spm:
+    name: SPM, `release` configuration (Xcode ${{ matrix.xcode-version }})
+    runs-on: macos-15
+    strategy:
+      fail-fast: false
+      matrix:
+        xcode-version: ['16.4']
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: ${{ matrix.xcode-version }}
+
+      - name: Build the AblyLiveObjects library in release configuration
+        run: swift build --target AblyLiveObjects --configuration release
+
+  liveobjects-build-and-test-xcode:
+    name: Xcode, ${{ matrix.platform }} (Xcode ${{ matrix.xcode-version }})
+    runs-on: macos-15
+    strategy:
+      fail-fast: false
+      matrix:
+        xcode-version: ['16.4']
+        platform: [macOS, iOS, tvOS]
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: ${{ matrix.xcode-version }}
+
+      - name: Build for testing
+        run: swift run LiveObjectsBuildTool build-library-for-testing --platform ${{ matrix.platform }}
+
+      - name: Run unit tests
+        run: swift run LiveObjectsBuildTool test-library --platform ${{ matrix.platform }} --only-unit-tests --without-building
+
+  liveobjects-build-release-configuration-xcode:
+    name: Xcode, `release` configuration, ${{ matrix.platform }} (Xcode ${{ matrix.xcode-version }})
+    runs-on: macos-15
+    strategy:
+      fail-fast: false
+      matrix:
+        xcode-version: ['16.4']
+        platform: [macOS, iOS, tvOS]
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: ${{ matrix.xcode-version }}
+
+      - name: Build library
+        run: swift run LiveObjectsBuildTool build-library --platform ${{ matrix.platform }} --configuration release

.swiftpm/xcode/xcshareddata/xcschemes/AblyLiveObjects.xcscheme

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+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1600"
+   version = "1.7">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES"
+      buildArchitectures = "Automatic">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "AblyLiveObjects"
+               BuildableName = "AblyLiveObjects"
+               BlueprintName = "AblyLiveObjects"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <TestPlans>
+         <TestPlanReference
+            reference = "container:merged-repos/ably-liveobjects-swift-plugin/TestPlans/AllTests.xctestplan"
+            default = "YES">
+         </TestPlanReference>
+         <TestPlanReference
+            reference = "container:merged-repos/ably-liveobjects-swift-plugin/TestPlans/UnitTests.xctestplan">
+         </TestPlanReference>
+      </TestPlans>
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "AblyLiveObjectsTests"
+               BuildableName = "AblyLiveObjectsTests"
+               BlueprintName = "AblyLiveObjectsTests"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "AblyLiveObjects"
+            BuildableName = "AblyLiveObjects"
+            BlueprintName = "AblyLiveObjects"
+            ReferencedContainer = "container:">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>