Step 101: annotation conflict highlighting

editor/tests/step101_test.cpp

@@ -0,0 +1,38 @@
+// Step 101 TDD Test: Annotation conflict detection
+//
+// Tests:
+// 1. Conflict detected between parent/child annotations
+
+#include <cassert>
+#include <iostream>
+#include "AnnotationConflict.h"
+#include "ast/Module.h"
+#include "ast/Function.h"
+#include "ast/Annotation.h"
+
+int main() {
+    int passed = 0;
+    int failed = 0;
+
+    auto* mod = new Module("m1", "mod", "cpp");
+    mod->setSpan(0, 0, 10, 0);
+    auto* fn = new Function("f1", "foo");
+    fn->setSpan(2, 0, 5, 0);
+    mod->addChild("functions", fn);
+
+    auto* parentAnno = new OwnerAnnotation("a1", "Shared_ARC");
+    auto* childAnno = new OwnerAnnotation("a2", "Single");
+    mod->addChild("annotations", parentAnno);
+    fn->addChild("annotations", childAnno);
+
+    std::vector<AnnotationConflict> conflicts;
+    collectAnnotationConflicts(mod, conflicts);
+    assert(conflicts.size() == 1);
+    assert(conflicts[0].childAnnoId == "a2");
+    assert(conflicts[0].parentAnnoId == "a1");
+    std::cout << "Test 1 PASS: conflict detected" << std::endl;
+    ++passed;
+
+    std::cout << "\n=== Step 101 Results: " << passed << " passed, " << failed << " failed ===" << std::endl;
+    return failed > 0 ? 1 : 0;
+}