refactor(ci): simplify Phase 4 - remove test summaries and coverage

Simplified Phase 4 developer experience improvements by removing:
- Test result summaries (GitHub step summaries)
- Coverage report generation
- Coverage artifact uploads

Phase 4 now only includes:
- Workflow status badges in README.md

This keeps the workflow simpler and focuses on essential visibility
improvements through badges without the overhead of generating
summaries and coverage reports that aren't needed.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: grdsdev

.github/workflows/dart-package-test.yml

@@ -91,52 +91,13 @@ jobs:
         run: sleep 5
 
       - name: Run tests
-        id: run_tests
-        continue-on-error: true
         run: |
           if [ "${{ inputs.test-concurrency }}" == "1" ]; then
             dart test --concurrency=1
           else
             dart test
           fi
 
-      - name: Generate test summary
-        if: always()
-        run: |
-          echo "## Test Results for ${{ inputs.package-name }} (SDK: ${{ matrix.sdk }})" >> $GITHUB_STEP_SUMMARY
-          echo "" >> $GITHUB_STEP_SUMMARY
-          if [ "${{ steps.run_tests.outcome }}" == "success" ]; then
-            echo "✅ All tests passed" >> $GITHUB_STEP_SUMMARY
-          else
-            echo "❌ Some tests failed" >> $GITHUB_STEP_SUMMARY
-          fi
-          echo "" >> $GITHUB_STEP_SUMMARY
-          echo "**Package:** \`${{ inputs.package-name }}\`" >> $GITHUB_STEP_SUMMARY
-          echo "**SDK Version:** \`${{ matrix.sdk }}\`" >> $GITHUB_STEP_SUMMARY
-          echo "**Working Directory:** \`${{ inputs.working-directory }}\`" >> $GITHUB_STEP_SUMMARY
-          if [ "${{ inputs.needs-docker }}" == "true" ]; then
-            echo "**Docker Services:** ✓ Required" >> $GITHUB_STEP_SUMMARY
-          fi
-
-      - name: Check test results
-        if: steps.run_tests.outcome != 'success'
-        run: exit 1
-
-      - name: Generate coverage report
-        if: matrix.sdk == 'stable'
-        run: |
-          dart pub global activate coverage
-          dart test --coverage=coverage
-          dart pub global run coverage:format_coverage --lcov --in=coverage --out=coverage/lcov.info --report-on=lib
-
-      - name: Upload coverage artifact
-        if: matrix.sdk == 'stable'
-        uses: actions/upload-artifact@v4
-        with:
-          name: coverage-${{ inputs.package-name }}
-          path: ${{ inputs.working-directory }}/coverage/
-          retention-days: 7
-
       - name: Stop Docker services
         if: ${{ inputs.needs-docker && always() }}
         run: |