fix(2meet-data-optimizer-hivepress-addon): map marketplace hot field to hp_price

- hivepress-marketplace stores its filterable, sortable listing price as
  hp_price; hp_purchase_price never existed (dev34: 588 hp_price rows)
- Drop hp_purchase_count: the addon keeps no per-listing sales counter
- Remove the stale docblock note about the legacy core registration path

Verify: vendor/bin/phpunit --filter test_on_register_fields_registers_hot_hp_price;
  addon unit 156 OK, integration 57 OK
PR: PR-011

includes/hivepress/adapters/class-tmdo-hivepress-marketplace-adapter.php

@@ -3,16 +3,12 @@
  * Marketplace adapter — `hivepress-marketplace` (DETECT-ONLY in v3.0.0).
  *
  * The marketplace addon turns listings into purchasable items, integrating
- * with WooCommerce. It adds:
+ * with WooCommerce. Its filterable, sortable listing attribute `price` is
+ * stored as `hp_price` → decimal(10,2), used in price-range filters (HOT).
  *
- *   hp_purchase_price  → decimal(10,2), used in price-range filters (HOT)
- *   hp_purchase_count  → counter (WARM zone, low-criticality)
- *
- * Note: `hp_purchase_price` is also conditionally registered by the existing
- * legacy hivepress integration (Sprint 1 left that path) — the dedup in
- * Schema_Registry is provider+key based, so registering again under the
- * `hivepress-marketplace` provider is safe and lets `wp wpdo doctor` show
- * the right ownership.
+ * Its other listing attributes (price tiers / extras / discounts, quantity,
+ * subscription period, …) are not search filters, and it keeps no per-listing
+ * sales counter.
  *
  * Detect-only: not installed in dev environment. Schema reserved for the
  * day the addon ships.
@@ -72,18 +68,12 @@ if ( ! class_exists( 'TMDO_HivePress_Marketplace_Adapter' ) ) {
 				array(
 					array(
 						'post_type' => 'hp_listing',
-						'meta_key'  => 'hp_purchase_price',
+						'meta_key'  => 'hp_price',
 						'zone'      => 'hot',
 						'data_type' => 'decimal(10,2) DEFAULT NULL',
-						'column'    => 'hp_purchase_price',
+						'column'    => 'hp_price',
 						'indexed'   => true,
 					),
-					array(
-						'post_type' => 'hp_listing',
-						'meta_key'  => 'hp_purchase_count',
-						'zone'      => 'warm',
-						'ttl'       => null,
-					),
 				)
 			);
 		}