chore(sdks): regenerate pxm and shopper SDKs from updated specs

.changeset/pim-shopper-admin-attributes-and-bundle-quantity.md

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+---
+"@epcc-sdk/sdks-pxm": minor
+---
+
+Add support for shopper and admin attributes, bundle quantity configuration, and selective column export on products.
+
+- New `ShopperAttributes` and `AdminAttributes` types (string→string maps, max 100 keys) on products, hierarchies and nodes. `shopper_attributes` are catalog-visible; `admin_attributes` are admin-only.
+- Product list/export endpoints now accept filters using `eq(shopper_attributes.<key>,…)` and `eq(admin_attributes.<key>,…)`.
+- Product import (CSV) supports `shopper_attributes.<key>` / `admin_attributes.<key>` columns, partial updates, and the `__REMOVE_ATTRIBUTE__` sentinel for deleting a key.
+- Product export request body supports `data.attributes.columns.include` to cherry-pick exported columns (including wildcards like `admin_attributes.*`).
+- Bundle component options now expose per-option `min` / `max` to configure shopper-selectable quantities.
+- Multi-product responses now include a `links` object (typed via the new `multi_links` schema).

.changeset/shopper-pricebook-segmentation-and-rule-validation.md

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+---
+"@epcc-sdk/sdks-shopper": minor
+---
+
+Regenerate from updated `catalog_view` spec. Adds pricebook segmentation, catalog rule validation and indexing completion types.
+
+- New endpoint `validateCatalogRules` (`POST /catalogs/rules/validate`) with `match_type` of `filter`, `similarity`, `conflict`, or `resolve_for_shopper`.
+- New product fields `available_prices`, `alternative_prices`, `available_pricebook_ids` on shopper-context product responses; component product metadata also gains `alternative_prices`.
+- New `EP-Pricebook-IDs-Of-Available-Prices-To-Show` request header (comma-delimited pricebook IDs or `'all'`) on release/product endpoints.
+- `getRules` filter now supports `pricebook_ids` (`eq()` and `in()`).
+- New types: `AvailablePrices`, `AlternativePrices`, `RuleMeta`, `CatalogRuleValidatorRequest`, `ReleaseIndexingCompleteData`.

.changeset/shopper-shipping-group-external-ref.md

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+---
+"@epcc-sdk/sdks-shopper": patch
+---
+
+Add `external_ref` field on shipping group request and response types (Cart Checkout). Optional string, max 64 characters, accepts alphanumeric/special characters/spaces, not required to be unique.