feat: Add LikeC4 validation and update tasks

- Add likec4:validate task for syntax checking (ignores layout drift)
- Add likec4:validate:layout task for full validation including layout
- Add likec4:update task to update LikeC4 in both projects
- Integrate likec4:validate into test and test:quick tasks
- Improves CI/CD pipeline by catching C4 syntax errors early

Taskfile.yml

@@ -58,12 +58,14 @@ tasks:
       - test:markdown
       - test:html
       - test:links
+      - likec4:validate
 
   test:quick:
     desc: Run quick tests (without link check)
     deps:
       - test:build
       - test:markdown
+      - likec4:validate
 
   test:build:
     desc: Test Hugo build
@@ -98,6 +100,31 @@ tasks:
     cmds:
       - cd resources/edp-likec4 && npx likec4 codegen webcomponent --webcomponent-prefix likec4 --outfile ../../static/js/likec4-webcomponent.js
 
+  likec4:validate:
+    desc: Validate LikeC4 models
+    cmds:
+      - echo "Validating EDP architecture models..."
+      - cd resources/edp-likec4 && npx likec4 validate --ignore-layout
+      - echo "Validating Documentation platform models..."
+      - cd resources/doc-likec4 && npx likec4 validate --ignore-layout
+      - echo "✓ All LikeC4 models validated successfully"
+
+  likec4:validate:layout:
+    desc: Validate LikeC4 models including layout
+    cmds:
+      - echo "Validating EDP architecture models (including layout)..."
+      - cd resources/edp-likec4 && npx likec4 validate
+      - echo "Validating Documentation platform models (including layout)..."
+      - cd resources/doc-likec4 && npx likec4 validate
+      - echo "✓ All LikeC4 models and layouts validated successfully"
+
+  likec4:update:
+    desc: Update LikeC4 to latest version
+    cmds:
+      - cd resources/edp-likec4 && npm update likec4
+      - cd resources/doc-likec4 && npm update likec4
+      - echo "✓ LikeC4 updated in both projects"
+
   # Development tasks
   deps:ensure-npm:
     desc: Ensure npm dependencies are installed