Add build infrastructure, installer scripts, and fix build errors

- Create vcpkg.json manifest with all editor dependencies
- Create CMakePresets.json for Windows (MSVC) and Linux (GCC)
- Create Inno Setup installer script (setup.iss) with file associations
- Create Windows build helper (build.ps1) with vcpkg auto-install
- Create Linux build/install scripts (build.sh, install.sh)
- Vendor imgui SDL2 backend locally (removed from vcpkg imgui 1.91+)
- Switch CMakeLists.txt from FetchContent to vcpkg find_package
- Fix ElispGenerator missing pure virtual overrides for memory annotations
- Fix Orchestrator::findNodeById const-correctness
- Fix orchestrator_main.cpp loadFile/saveFile type mismatches
- Fix main.cpp SDL_GL_SwapBuffers -> SDL_GL_SwapWindow

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

editor/src/ast/Generator.h

@@ -1276,6 +1276,26 @@ public:
     std::string visitLangSpecific(const LangSpecific* annotation) override {
         return "; @lang_specific(" + annotation->language + ", " + annotation->idiomType + ")";
     }
+
+    std::string visitDeallocateAnnotation(const DeallocateAnnotation* annotation) override {
+        return "; @dealloc(" + annotation->strategy + ")";
+    }
+
+    std::string visitLifetimeAnnotation(const LifetimeAnnotation* annotation) override {
+        return "; @lifetime(" + annotation->strategy + ")";
+    }
+
+    std::string visitReclaimAnnotation(const ReclaimAnnotation* annotation) override {
+        return "; @reclaim(" + annotation->strategy + ")";
+    }
+
+    std::string visitOwnerAnnotation(const OwnerAnnotation* annotation) override {
+        return "; @owner(" + annotation->strategy + ")";
+    }
+
+    std::string visitAllocateAnnotation(const AllocateAnnotation* annotation) override {
+        return "; @allocate(" + annotation->strategy + ")";
+    }
 };
 
 class CppGenerator : public ProjectionGenerator {