v0.34.3

Fixed

• Out-of-stock products no longer advertise a buy link that errors at the cart (#606).
  • An out-of-stock product emitted potentialAction (BuyAction) and offers[].checkoutPageURLTemplate alongside availability: OutOfStock. Following that advertised URL didn't merely dead-end — it landed on an empty cart carrying ?wc_error=You cannot add "…" to the cart because the product is out of stock, so an AI agent or search crawler acting on the published JSON-LD reached a broken flow.
  • Both emission sites gated on is_purchasable() alone, which in WooCommerce core is exists && published && has a price and never consults stock — while WC_Cart::add_to_cart() rejects on ! is_in_stock(). The two gates were checking different things. Buy-link emission now additionally requires is_in_stock(), at both the parent/simple path and the per-variant path.
  • Descriptive fields (@id, name, sku, image, offers[].price, offers[].availability) still emit, so agents continue to see that the product exists and why it can't be bought — they just aren't handed a URL that fails.
  • Backordered products keep their buy links. The predicate is is_in_stock(), not a stock-quantity test: a backordered product reports in-stock, WooCommerce accepts it at cart-add, and its availability is BackOrder. Gating on quantity would have suppressed exactly the oversold-but-orderable variants corrected in #601.