Step 144: add Emacs keybinding integration

editor/tests/step144_test.cpp

@@ -0,0 +1,49 @@
+// Step 144 TDD Test: Emacs keybinding deep integration
+#include "EmacsKeybinding.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;
+
+    MockEmacsConnection mock;
+    EmacsKeybindingState state;
+    std::string log;
+
+    bool prefixOk = emacsHandleKeySequence(state, mock, "C-x", log);
+    expect(prefixOk, "prefix handled", passed, failed);
+    expect(state.prefix == "C-x", "prefix stored", passed, failed);
+
+    bool seqOk = emacsHandleKeySequence(state, mock, "C-s", log);
+    expect(seqOk, "sequence handled", passed, failed);
+    expect(state.prefix.empty(), "prefix cleared", passed, failed);
+    expect(state.lastCommand == "save-buffer", "command resolved", passed, failed);
+    expect(mock.getLastSentCommand().find("call-interactively") != std::string::npos,
+           "call-interactively sent", passed, failed);
+
+    bool mxOk = emacsHandleKeySequence(state, mock, "M-x", log);
+    expect(mxOk, "M-x handled", passed, failed);
+    expect(state.minibufferActive, "minibuffer active", passed, failed);
+
+    std::snprintf(state.minibufferBuf, sizeof(state.minibufferBuf), "find-file");
+    bool mbOk = emacsExecuteMinibuffer(state, mock, log);
+    expect(mbOk, "minibuffer command executed", passed, failed);
+    expect(!state.minibufferActive, "minibuffer cleared", passed, failed);
+
+    updateEmacsModeLine(state, mock, 2.0, log);
+    expect(!state.modeLine.empty(), "mode line updated", passed, failed);
+
+    std::cout << "\n=== Step 144 Results: " << passed << " passed, "
+              << failed << " failed ===\n";
+    return failed == 0 ? 0 : 1;
+}