refactor(ci): Separate Build/Test and Documentation Workflows

.github/workflows/ci.yml

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+name: PactKit CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "*" ]
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build-and-test-library:
+    name: Test PactKitCore
+    runs-on: macos-15
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Cache Swift PM dependencies
+        uses: actions/cache@v4
+        with:
+          path: .build
+          key: ${{ runner.os }}-spm-${{ hashFiles('**/Package.resolved') }}
+          restore-keys: |
+            ${{ runner.os }}-spm-
+
+      - name: Select Xcode 16.4
+        run: sudo xcode-select -s /Applications/Xcode_16.4.app/Contents/Developer
+
+      - name: Run library tests
+        run: swift test
+
+  build-example-app:
+    name: Build Example App
+    needs: build-and-test-library
+    runs-on: macos-15
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Select Xcode 16.4
+        run: sudo xcode-select -s /Applications/Xcode_16.4.app/Contents/Developer
+
+      - name: Build iOS Example App
+        run: |
+          xcodebuild build \
+            -project Examples/PactKit-iOS-Example/PactKit-iOS-Example.xcodeproj \
+            -scheme PactKit-iOS-Example \
+            -destination 'platform=iOS Simulator,name=iPhone 16 Pro'

.github/workflows/documentation.yml

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+name: Documentation
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+concurrency:
+  group: docs-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: write
+
+jobs:
+  deploy-docs:
+    name: Deploy Documentation
+    runs-on: macos-15
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Select Xcode 16.4
+        run: sudo xcode-select -s /Applications/Xcode_16.4.app/Contents/Developer
+
+      - name: Generate DocC documentation
+        run: |
+          swift package \
+            --allow-writing-to-directory ./public \
+            generate-documentation \
+            --target PactKitCore \
+            --output-path ./public \
+            --transform-for-static-hosting \
+            --hosting-base-path PactKit
+
+      - name: Create .nojekyll file
+        run: touch ./public/.nojekyll
+
+      - name: Deploy to GitHub Pages
+        uses: JamesIves/github-pages-deploy-action@v4
+        with:
+          branch: gh-pages
+          folder: public