Steps 297-302: Phase 11b complete + Phase 11c step 302 (68/68 tests)

Phase 11b — Validation & Conflict Completion:
- Step 297: Subject 2-4 validation rules E0600-E0805 (12/12)
- Step 298: Subject 5-8 validation rules E0900-E1202 (12/12)
- Step 299: Cross-type conflict detection, 6 conflict pairs (12/12)
- Step 300: TransformEngineExtended — float folding, dead var, annotation-aware (12/12)
- Step 301: Phase 11b integration tests (8/8)

Phase 11c — Parser Deepening (start):
- Step 302: New AST nodes — ClassDeclaration, InterfaceDeclaration,
  MethodDeclaration, GenericType, TypeParameter with JSON roundtrip (12/12)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

editor/CMakeLists.txt

@@ -1795,4 +1795,22 @@ foreach(STEP 290 291 292 293 294 295 296)
         tree_sitter_org)
 endforeach()
 
+# Phase 11b: Validation & Conflict Completion (Steps 297-301)
+foreach(STEP 297 298 299 300 301)
+    add_executable(step${STEP}_test tests/step${STEP}_test.cpp)
+    target_include_directories(step${STEP}_test PRIVATE src)
+    target_link_libraries(step${STEP}_test PRIVATE
+        nlohmann_json::nlohmann_json
+        unofficial::tree-sitter::tree-sitter
+        tree_sitter_python tree_sitter_cpp tree_sitter_elisp
+        tree_sitter_javascript tree_sitter_typescript
+        tree_sitter_java tree_sitter_rust tree_sitter_go
+        tree_sitter_org)
+endforeach()
+
+# Phase 11c: Parser Deepening (Steps 302-308)
+add_executable(step302_test tests/step302_test.cpp)
+target_include_directories(step302_test PRIVATE src)
+target_link_libraries(step302_test PRIVATE nlohmann_json::nlohmann_json)
+
 # Step 12: Dear ImGui shell scaffolding created (main.cpp exists but not built due to dependencies)