feat: implement module access in engine API

- Add implementation for `getModule`
- Add implementation for `getLoadedModules`

src/engine/core/engine.cpp

@@ -59,7 +59,28 @@ MscEventBus &MscEngine::getBus()
   return _bus;
 }
 
-UNIMPL MscEngine::getLoadedModules() const
+std::unordered_map<std::string, std::uint16_t> MscEngine::getLoadedModules() const
 {
-  throw std::runtime_error("Unimplemented");
+  std::unordered_map<std::string, std::uint16_t> result;
+  for (const auto &module : _modules)
+  {
+    if (!module)
+      continue;
+
+    auto mod = module.get();
+    result[mod->getName()] = mod->getRev();
+  }
+
+  return result;
+}
+
+MscEngineModule &MscEngine::getModule(const std::string &name)
+{
+  for (auto &module : _modules)
+  {
+    if (module.get()->getName() == name)
+      return *module.get();
+  }
+
+  throw std::runtime_error("Module not found: " + name);
 }