Step 107b: gate UI by editor mode

editor/tests/step107b_test.cpp

@@ -0,0 +1,27 @@
+// Step 107b TDD Test: Editor mode policy
+//
+// Tests:
+// 1. Structured mode allows structured features
+// 2. Text mode disables structured features
+
+#include <cassert>
+#include <iostream>
+#include "EditorModePolicy.h"
+
+int main() {
+    int passed = 0;
+    int failed = 0;
+
+    assert(allowStructuredFeatures(BufferManager::BufferMode::Structured));
+    assert(!isTextMode(BufferManager::BufferMode::Structured));
+    std::cout << "Test 1 PASS: structured mode allowed" << std::endl;
+    ++passed;
+
+    assert(!allowStructuredFeatures(BufferManager::BufferMode::Text));
+    assert(isTextMode(BufferManager::BufferMode::Text));
+    std::cout << "Test 2 PASS: text mode disabled" << std::endl;
+    ++passed;
+
+    std::cout << "\n=== Step 107b Results: " << passed << " passed, " << failed << " failed ===" << std::endl;
+    return failed > 0 ? 1 : 0;
+}