ci: enroll woocommerce hardening branches in nightly integration

Adds the three WooCommerce PRs that are currently open against
openxe-org/openxe to the nightly production manifest:

- fix/woocommerce-order-import-pagination (PR OpenXE-org#265) — foundation
- feature/woocommerce-batch-stock-sync     (PR OpenXE-org#266) — independent
- refactor/woocommerce-composer-sdk         (PR OpenXE-org#267) — stacked on OpenXE-org#265,
  listed after it so the sequential merge in Pass 2 picks the dependency
  up first and the composer refactor applies on top cleanly.

Grouped under a dedicated header block so the intent stays visible
once the PRs merge upstream and can be removed from the manifest.

Author: Avatarsia

.github/integration-branches.txt

@@ -44,3 +44,11 @@ fix/250-wiedervorlage-sidebar-counter
 fix/dateien-stichwoerter-245
 fix/versandpakete-247
 fix/player-custom-module-support
+
+# WooCommerce hardening (open PRs on openxe-org, stacked)
+# #265 Pagination-Fix — foundation for #267
+fix/woocommerce-order-import-pagination
+# #266 Batch stock sync — independent
+feature/woocommerce-batch-stock-sync
+# #267 Composer-based WC SDK — stacked on #265, must follow it
+refactor/woocommerce-composer-sdk