refactor(2meet-data-optimizer-hivepress-addon): stop registering Hot zone fields

- ADR-003 step 4 (AddOn side): core, requests, bookings, memberships and
  marketplace adapters no longer register zone=hot fields or contribute
  hot_* FSM modules; their keys live in TMDO_HivePress_Entity_Groups.
  Cold/warm registrations are unchanged.
- Hot-table doctor probes go with them (trait defaults apply). The
  hot-clause query rewrite and cron optimizer are now inert and are left
  for the ADR step-5 removal together with core's hot path.
- New NoHotZoneRegistrationTest pins the invariant across all 13 adapters;
  per-adapter hot assertions removed.
- Verify: HP unit 142 / integration 49 green, phpcs clean (WordPress)
- PR: PR-037

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

@@ -5,8 +5,8 @@
  * Two related models:
  *
  *   - Request (post_type=hp_request)
- *       hot fields: hp_drafted (bool), hp_expired_time (unix ts)
- *       — same access pattern as Listing (user dashboard + expiry cron)
+ *       hp_drafted / hp_expired_time are flattened by the `hp_draft_flags`
+ *       and `hp_request_core` entity groups (TMDO_HivePress_Entity_Groups).
  *
  *   - Offer   (comment_type=hp_offer, parent post_type=hp_request)
  *       stored in comment columns only — no comment meta to flatten.
@@ -59,74 +59,6 @@ if ( ! class_exists( 'TMDO_HivePress_Requests_Adapter' ) ) {
 		public function minimum_addon_version(): string {
 			return '1.2.0';
 		}
-
-		/**
-		 * Register hot fields for hp_request post type.
-		 *
-		 * @param TMDO_Schema_Registry $registry Schema registry singleton.
-		 */
-		public function on_register_fields( TMDO_Schema_Registry $registry ): void {
-			$registry->register_many(
-				$this->plugin_slug(),
-				array(
-					array(
-						'post_type' => 'hp_request',
-						'meta_key'  => 'hp_drafted',
-						'zone'      => 'hot',
-						'data_type' => 'tinyint(1) NOT NULL DEFAULT 0',
-						'column'    => 'hp_drafted',
-						'indexed'   => true,
-					),
-					array(
-						'post_type' => 'hp_request',
-						'meta_key'  => 'hp_expired_time',
-						'zone'      => 'hot',
-						'data_type' => 'bigint(20) UNSIGNED NOT NULL DEFAULT 0',
-						'column'    => 'hp_expired_time',
-						'indexed'   => true,
-					),
-				)
-			);
-		}
-
-		/**
-		 * Doctor probe — request hot table.
-		 *
-		 * @return array{ok:bool, message:string, details?:array<string,mixed>}
-		 */
-		public function doctor_check(): array {
-			global $wpdb;
-			if ( ! isset( $wpdb ) || ! is_object( $wpdb ) ) {
-				return array(
-					'ok'      => false,
-					'message' => 'wpdb global not available',
-				);
-			}
-			$table = $wpdb->prefix . 'wpdo_hot_hp_request';
-			try {
-				$exists = (bool) $wpdb->get_var( $wpdb->prepare( 'SHOW TABLES LIKE %s', $table ) );
-				return array(
-					'ok'      => $exists,
-					'message' => $exists
-						? sprintf( 'hivepress-requests: %s present', $table )
-						: sprintf( 'hivepress-requests: %s missing', $table ),
-				);
-			} catch ( \Throwable $e ) {
-				return array(
-					'ok'      => false,
-					'message' => sprintf( 'hivepress-requests doctor failed: %s', $e->getMessage() ),
-				);
-			}
-		}
-
-		/**
-		 * FSM modules this adapter contributes.
-		 *
-		 * @return array<int,string>
-		 */
-		public function migrations(): array {
-			return array( 'hot_hp_request' );
-		}
 	}
 
 } // end if ( ! class_exists )