Step 122: add integrated terminal panel

editor/tests/step122_test.cpp

@@ -0,0 +1,32 @@
+// Step 122 TDD Test: Terminal panel command building + output append
+#include "TerminalPanel.h"
+#include <iostream>
+
+static void expect(bool cond, const std::string& name, int& passed, int& failed) {
+    if (cond) {
+        std::cout << "Test " << (passed + failed + 1) << " PASS: " << name << "\n";
+        ++passed;
+    } else {
+        std::cout << "Test " << (passed + failed + 1) << " FAIL: " << name << "\n";
+        ++failed;
+    }
+}
+
+int main() {
+    int passed = 0;
+    int failed = 0;
+
+    // Test 1: command line includes cwd + command + stderr redirect
+    std::string cmd = TerminalPanel::buildCommandLine("C:\\work", "echo hi");
+    expect(cmd.find("echo hi") != std::string::npos, "command contains payload", passed, failed);
+    expect(cmd.find("2>&1") != std::string::npos, "command captures stderr", passed, failed);
+
+    // Test 2: output append works
+    TerminalPanel panel;
+    panel.append("hello");
+    panel.append(" world");
+    expect(panel.getOutput() == "hello world", "append output", passed, failed);
+
+    std::cout << "\n=== Step 122 Results: " << passed << " passed, " << failed << " failed ===\n";
+    return failed == 0 ? 0 : 1;
+}