Fix bd-28: Auto-import should update issues, not create duplicates

Changed ResolveCollisions from true to false in auto-import logic.
This ensures git pull updates existing issues instead of creating duplicates.

internal/rpc/server_export_import_auto.go

@@ -218,8 +218,8 @@ func (s *Server) checkAndAutoImportIfStale(req *Request) error {
 	importFunc := func(ctx context.Context, issues []*types.Issue) (created, updated int, idMapping map[string]string, err error) {
 		// Use the importer package to perform the actual import
 		result, err := importer.ImportIssues(ctx, dbPath, store, issues, importer.Options{
-			ResolveCollisions: true, // Auto-resolve collisions for auto-import
-			RenameOnImport:    true, // Auto-rename prefix mismatches
+			ResolveCollisions: false, // Do NOT resolve collisions - update existing issues by ID
+			RenameOnImport:    true,  // Auto-rename prefix mismatches
 			// Note: SkipPrefixValidation is false by default, so we validate and rename
 		})
 		if err != nil {