v2.1.0

Added

• client.orders_2026, the Orders API v2026-01-01, in V2 only.
  search_orders replaces get_orders; get_order returns the items
  and, through included_data:, the buyer, recipient and other blocks
  that v0 served from separate operations. The API takes no restricted
  data token, so the methods have no rdt: keyword. The body has no
  payload wrapper: read payload[:orders] and
  payload.dig(:pagination, :nextToken). README, "Orders API
  v2026-01-01", lists the differences; Amazon's migration guide maps
  the fields.
• rdt: false in codegen-config.yml drops the rdt: keyword from a
  module whose API never uses restricted data tokens.
• get_feed_document and get_report_document take
  enable_content_encoding_url_header: (V2), or the same key in opts
  (v1), new in Amazon's specs.

Changed

• The Amazon models pin moves from 2025-02-26 to 2026-08-26. Apart from
  the parameter above, the regenerated code differs only in comments.
  Amazon marks every Orders v0 operation deprecated; orders_v0 stays
  in v1 and V2 until v1 is removed.