feat(lib): add loader types for command/event loading

- Add LoadResult interface to track loading statistics
- Add LoadError interface for structured error reporting
- Foundation for modular loader architecture

src/lib/loaders/types.ts

@@ -0,0 +1,16 @@
+/**
+ * Result of loading commands or events
+ */
+export interface LoadResult {
+    loaded: number;
+    skipped: number;
+    errors: LoadError[];
+}
+
+/**
+ * Error that occurred during loading
+ */
+export interface LoadError {
+    file: string;
+    error: unknown;
+}