feat(editor): git integration for collaborative expansion development

- File > Project > Git submenu: Init, Commit, Push, Pull operations
- Init Git Repo: initializes git in the project directory with initial commit
- Commit Changes: auto-saves zone then commits all changes
- Push/Pull: sync with remote repositories for team collaboration
- Git Status: shows current repo state directly in the menu
- Teams can collaborate on custom expansions using standard git workflows

tools/editor/editor_project.cpp

@@ -100,6 +100,42 @@ bool EditorProject::load(const std::string& path) {
     return true;
 }
 
+bool EditorProject::initGitRepo() const {
+    if (projectDir.empty()) return false;
+    int ret = std::system(("cd \"" + projectDir + "\" && git init && git add -A && "
+                           "git commit -m \"Initial project commit\"").c_str());
+    return ret == 0;
+}
+
+bool EditorProject::gitCommit(const std::string& message) const {
+    if (projectDir.empty()) return false;
+    int ret = std::system(("cd \"" + projectDir + "\" && git add -A && "
+                           "git commit -m \"" + message + "\"").c_str());
+    return ret == 0;
+}
+
+bool EditorProject::gitPush() const {
+    if (projectDir.empty()) return false;
+    return std::system(("cd \"" + projectDir + "\" && git push").c_str()) == 0;
+}
+
+bool EditorProject::gitPull() const {
+    if (projectDir.empty()) return false;
+    return std::system(("cd \"" + projectDir + "\" && git pull").c_str()) == 0;
+}
+
+std::string EditorProject::gitStatus() const {
+    if (projectDir.empty()) return "No project directory";
+    std::string cmd = "cd \"" + projectDir + "\" && git status --short 2>&1";
+    FILE* pipe = popen(cmd.c_str(), "r");
+    if (!pipe) return "git not available";
+    char buf[256];
+    std::string result;
+    while (fgets(buf, sizeof(buf), pipe)) result += buf;
+    pclose(pipe);
+    return result.empty() ? "Clean (no changes)" : result;
+}
+
 std::string EditorProject::getZoneOutputDir(int zoneIdx) const {
     if (zoneIdx < 0 || zoneIdx >= static_cast<int>(zones.size())) return "";
     return projectDir + "/" + zones[zoneIdx].mapName;

tools/editor/editor_project.hpp

@@ -26,6 +26,13 @@ struct EditorProject {
     bool save(const std::string& path) const;
     bool load(const std::string& path);
     std::string getZoneOutputDir(int zoneIdx) const;
+
+    // Git integration for collaborative expansion development
+    bool initGitRepo() const;
+    bool gitCommit(const std::string& message) const;
+    bool gitPush() const;
+    bool gitPull() const;
+    std::string gitStatus() const;
 };
 
 } // namespace editor

tools/editor/editor_ui.cpp

@@ -172,6 +172,27 @@ void EditorUI::renderMenuBar(EditorApp& app) {
                     }
                     ImGui::EndMenu();
                 }
+                ImGui::Separator();
+                if (ImGui::BeginMenu("Git (Collaboration)")) {
+                    if (ImGui::MenuItem("Init Git Repo")) {
+                        if (app.getProject().initGitRepo())
+                            app.showToast("Git repo initialized");
+                        else
+                            app.showToast("Git init failed");
+                    }
+                    if (ImGui::MenuItem("Commit Changes")) {
+                        app.quickSave();
+                        if (app.getProject().gitCommit("Editor save"))
+                            app.showToast("Changes committed");
+                    }
+                    if (ImGui::MenuItem("Push to Remote"))
+                        app.getProject().gitPush() ? app.showToast("Pushed") : app.showToast("Push failed");
+                    if (ImGui::MenuItem("Pull from Remote"))
+                        app.getProject().gitPull() ? app.showToast("Pulled") : app.showToast("Pull failed");
+                    ImGui::Separator();
+                    ImGui::TextWrapped("%s", app.getProject().gitStatus().c_str());
+                    ImGui::EndMenu();
+                }
                 ImGui::Text("Project: %s (%zu zones)",
                             app.getProject().name.c_str(),
                             app.getProject().zones.size());