Stage the 2026-11 product asset dump: ignore migrations/product_images_in2/

The agency "Products Hero page" delivery (banners, product photos) is
staged per product slug under migrations/product_images_in2/ and
imported with the existing vitec:import-product-images command;
the staging directory stays out of the repo like product_images_in/.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitignore

@@ -135,6 +135,7 @@ migrations/submarkets_xlsx_in/*
 migrations/subsolutions_xlsx_in/*
 migrations/solutiongroups_xlsx_in/*
 migrations/product_images_in/
+migrations/product_images_in2/
 migrations/markethero_xlsx_in/
 migrations/product_categories_xlsx_in/