feat(types): add treemap for part-of-whole by area (#87)

Add Treemap as the 28th visual type with light, dark, and editorial variants; area, label, and information-marker verification; synchronized documentation and manifests; and plugin version 2.5.0.

.github/workflows/ci.yml

@@ -185,6 +185,16 @@ jobs:
         id: geometry_tests
         run: python scripts/test-verify-geometry.py
 
+      - name: Verify treemap area fidelity and label fit
+        if: always()
+        id: treemap
+        run: python scripts/verify-treemap.py --all
+
+      - name: Verify treemap checker
+        if: always()
+        id: treemap_tests
+        run: python scripts/test-verify-treemap.py
+
       - name: Verify generated icon assets
         if: always()
         id: icons
@@ -219,4 +229,6 @@ jobs:
           echo "| Packaged Self-Check | ${{ steps.self_check.outcome == 'success' && '✅ Passed' || (steps.self_check.outcome == 'skipped' && '⏭️ Skipped' || '❌ Failed') }} |" >> $GITHUB_STEP_SUMMARY
           echo "| Label Geometry | ${{ steps.geometry.outcome == 'success' && '✅ Passed' || (steps.geometry.outcome == 'skipped' && '⏭️ Skipped' || '❌ Failed') }} |" >> $GITHUB_STEP_SUMMARY
           echo "| Label Geometry Checker | ${{ steps.geometry_tests.outcome == 'success' && '✅ Passed' || (steps.geometry_tests.outcome == 'skipped' && '⏭️ Skipped' || '❌ Failed') }} |" >> $GITHUB_STEP_SUMMARY
+          echo "| Treemap Area & Label Fit | ${{ steps.treemap.outcome == 'success' && '✅ Passed' || (steps.treemap.outcome == 'skipped' && '⏭️ Skipped' || '❌ Failed') }} |" >> $GITHUB_STEP_SUMMARY
+          echo "| Treemap Checker | ${{ steps.treemap_tests.outcome == 'success' && '✅ Passed' || (steps.treemap_tests.outcome == 'skipped' && '⏭️ Skipped' || '❌ Failed') }} |" >> $GITHUB_STEP_SUMMARY
           echo "| Primitive Icons & Documentation | ${{ steps.icons.outcome == 'success' && '✅ Passed' || (steps.icons.outcome == 'skipped' && '⏭️ Skipped' || '❌ Failed') }} |" >> $GITHUB_STEP_SUMMARY