Fix coverage aggregation in parallel test workflow

Problem:
The aggregate-coverage job was failing because koverXmlReportMergedCoverage
requires all tests to have run in the same Gradle session. When tests are
split across separate jobs, Kover has no test execution data to merge.

Root Cause:
- Kover collects binary coverage data during test execution
- koverXmlReportMergedCoverage merges this data from the current build
- In parallel jobs, the aggregation job never ran any tests
- Result: No coverage data to merge, causing exit code 1

Solution:
1. Each test job now generates its own XML coverage report immediately
   after running tests:
   - test-libraries: koverXmlReportDebug for each library module
   - test-app: koverXmlReportStandardDebug
   - test-authenticator: koverXmlReportDebug

2. Coverage artifacts now contain XML reports, not just binary data

3. Aggregation job simplified:
   - Remove Fastlane/Ruby setup (no longer needed)
   - Download all coverage-* artifacts
   - Upload entire coverage-reports/ directory to codecov
   - Codecov automatically merges multiple XML files

Benefits:
- Each module's coverage is captured independently
- No dependency on cross-job Gradle state
- Codecov handles merging (tested and reliable)
- Simpler, more maintainable workflow

Technical Details:
- Kover generates XML reports at: module/build/reports/kover/report*.xml
- Codecov action with directory parameter finds all XML files recursively
- disable_search=false allows automatic file discovery

.github/workflows/test.yml

@@ -113,6 +113,12 @@ jobs:
         run: |
           ./gradlew :core:testDebug :data:testDebug :network:testDebug :ui:testDebug :authenticatorbridge:testDebug :cxf:testDebug
 
+      - name: Generate library coverage reports
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          ./gradlew :core:koverXmlReportDebug :data:koverXmlReportDebug :network:koverXmlReportDebug :ui:koverXmlReportDebug :authenticatorbridge:koverXmlReportDebug :cxf:koverXmlReportDebug
+
       - name: Upload library test reports
         uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
         if: always()
@@ -184,6 +190,11 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: ./gradlew :app:testStandardDebug
 
+      - name: Generate app coverage report
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: ./gradlew :app:koverXmlReportStandardDebug
+
       - name: Upload app test reports
         uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
         if: always()
@@ -243,6 +254,11 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: ./gradlew :authenticator:testDebug
 
+      - name: Generate authenticator coverage report
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: ./gradlew :authenticator:koverXmlReportDebug
+
       - name: Upload authenticator test reports
         uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
         if: always()
@@ -285,42 +301,11 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-gradle-v2-
 
-      - name: Configure Ruby
-        uses: ruby/setup-ruby@44511735964dcb71245e7e55f72539531f7bc0eb # v1.257.0
-        with:
-          bundler-cache: true
-
-      - name: Configure JDK
-        uses: actions/setup-java@dded0888837ed1f317902acf8a20df0ad188d165 # v5.0.0
-        with:
-          distribution: "temurin"
-          java-version: ${{ env._JAVA_VERSION }}
-
-      - name: Install Fastlane
-        run: |
-          gem install bundler:2.2.27
-          bundle config path vendor/bundle
-          bundle install --jobs 4 --retry 3
-
       - name: Download all coverage artifacts
         uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
         with:
           pattern: coverage-*
-          merge-multiple: true
-          path: coverage-data/
-
-      - name: Generate merged coverage report
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          bundle exec fastlane koverXmlReportMergedCoverage
-
-      - name: Upload merged coverage report
-        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
-        if: always()
-        with:
-          name: merged-coverage-report
-          path: build/reports/kover/reportMergedCoverage.xml
+          path: coverage-reports/
 
       - name: Upload to codecov.io
         id: upload-to-codecov
@@ -329,9 +314,9 @@ jobs:
         continue-on-error: true
         with:
           os: linux
-          files: build/reports/kover/reportMergedCoverage.xml
+          directory: coverage-reports/
           fail_ci_if_error: true
-          disable_search: true
+          disable_search: false
 
       - name: Comment PR if coverage upload failed
         if: steps.upload-to-codecov.outcome == 'failure' && (github.event_name == 'push' || github.event_name == 'pull_request')