Step 104: add cross-language projection action

editor/tests/step104_test.cpp

@@ -0,0 +1,37 @@
+// Step 104 TDD Test: Cross-language projection
+//
+// Tests:
+// 1. Projected module uses target language
+// 2. Annotation types preserved across projection
+
+#include <cassert>
+#include <iostream>
+#include "CrossLanguageProjector.h"
+#include "ast/Module.h"
+#include "ast/Function.h"
+#include "ast/Annotation.h"
+
+int main() {
+    int passed = 0;
+    int failed = 0;
+
+    Module mod("m1", "mod", "python");
+    auto* fn = new Function("f1", "foo");
+    auto* anno = new ReclaimAnnotation("a1", "Tracing");
+    fn->addChild("annotations", anno);
+    mod.addChild("functions", fn);
+
+    CrossLanguageProjector projector;
+    auto projected = projector.project(&mod, "cpp");
+
+    assert(projected && projected->targetLanguage == "cpp");
+    std::cout << "Test 1 PASS: target language set" << std::endl;
+    ++passed;
+
+    assert(projector.annotationsPreserved(&mod, projected.get()));
+    std::cout << "Test 2 PASS: annotations preserved" << std::endl;
+    ++passed;
+
+    std::cout << "\n=== Step 104 Results: " << passed << " passed, " << failed << " failed ===" << std::endl;
+    return failed > 0 ? 1 : 0;
+}