feat: enable immediate loading of service overrides during registration (#232)

src/services/registry.ts

@@ -2,12 +2,24 @@ type Class<T> = new (...args: any[]) => T;
 
 interface Service<T> {
   defaultImpl: Class<T>;
+  override?: Class<T>;
 }
 
 const registry = new Map<string, Service<any>>();
 const instances = new Map<string, unknown>();
 
 export function registerService<T>(key: string, entry: Service<T>) {
+  // Try to load override immediately during registration
+  const overridePath = './' + key + 'x.js';
+  import(overridePath)
+    .then((mod) => {
+      const override = mod[key.charAt(0).toUpperCase() + key.slice(1) + 'x'];
+      if (typeof override === 'function') {
+        entry.override = override;
+      }
+    })
+    .catch(() => {}); // Silently ignore if override doesn't exist
+
   registry.set(key, entry);
 }
 
@@ -19,17 +31,8 @@ export function getService<T>(key: string): T {
   const entry = registry.get(key);
   if (!entry) throw new Error(`Service not registered for key: ${key.toString()}`);
 
-  let Impl = entry.defaultImpl;
-
-  const overridePath = './' + key + 'x.js';
-  import(overridePath)
-    .then((mod) => {
-      const override = mod[key.charAt(0).toUpperCase() + key.slice(1) + 'x'] ?? Impl.name;
-      if (typeof override === 'function') {
-        Impl = override;
-      }
-    })
-    .catch(() => {});
+  // Use override if available, otherwise use default
+  const Impl = entry.override || entry.defaultImpl;
 
   const instance = new Impl();
   instances.set(key, instance);