feat: start of git integration

src/main/engine/index.ts

@@ -72,4 +72,14 @@ export {
   type DiffField,
   type ScanResult,
   type TableStats,
-} from './MetadataDiffEngine';
+} from './MetadataDiffEngine';
+export {
+  GitEngine,
+  getGitEngine,
+  type GitAvailability,
+  type RepoState,
+  type GitStatusDto,
+  type GitStatusFile,
+  type GitStatusCounts,
+  type GitInitResult,
+} from './GitEngine';