feat(enchantedparks): add Mid-America Parks (former Six Flags St. Louis)

Six Flags St. Louis was sold to EPR Properties on 2026-04-06 as part
of the same April 2026 divestment wave that covered Worlds of Fun and
Michigan's Adventure. The park is operated by Enchanted Parks under
the lease; its WordPress/Tribe Events site at
mid-americaparks.enchantedparks.com is already live and matches the
stack used by the existing EP subclasses.

Add a MidAmericaParks subclass mirroring worldsoffun.ts: a theme park
(MAP) plus Hurricane Harbor (HH). Verified live:
  - 41 attractions parsed via the existing scraper
  - 129 schedule days returned via Tribe Events
  - 0 live data (parity with siblings — EP source has no wait times)

Update the SixFlags EXCLUDED_PARK_IDS comment block to:
  - Point parkId 903 at the new enchantedparks/midamericaparks module
  - Clarify that La Ronde (969) has no usable primary source distinct
    from the Six Flags app (Premier Parks LLC has no shared
    guest-experience platform), correcting the earlier "divested to
    La Ronde Operations" placeholder

Author: cubehouse

src/parks/enchantedparks/midamericaparks.ts

@@ -0,0 +1,35 @@
+import {EnchantedParks} from './enchantedparks.js';
+import {destinationController} from '../../destinationRegistry.js';
+import type {DestinationConstructor} from '../../destination.js';
+
+@destinationController({category: ['Enchanted Parks', 'Mid-America Parks']})
+export class MidAmericaParks extends EnchantedParks {
+  constructor(options?: DestinationConstructor) {
+    super({
+      ...options,
+      config: {
+        destinationId: 'enchantedparks_midamericaparks',
+        destinationName: 'Mid-America Parks',
+        timezone: 'America/Chicago',
+        ...(options?.config ?? {}),
+      },
+    });
+    this.destinationLocation ??= {latitude: 38.5128, longitude: -90.6724};
+    this.themePark ??= {
+      id: 'enchantedparks_park_MAP',
+      code: 'MAP',
+      name: 'Mid-America Parks',
+      ridesPath: 'attractions',
+      scheduleCategory: 'Park Hours',
+      location: {latitude: 38.5128, longitude: -90.6724},
+    };
+    this.waterPark ??= {
+      id: 'enchantedparks_park_HH',
+      code: 'HH',
+      name: 'Hurricane Harbor',
+      ridesPath: 'hurricane-harbor-water-park',
+      scheduleCategory: 'Waterpark Hours',
+      location: {latitude: 38.5128, longitude: -90.6724},
+    };
+  }
+}

src/parks/sixflags/sixflags.ts

@@ -161,23 +161,23 @@ const PARKS_WITHOUT_WAIT_TIMES = new Set([942, 944, 947, 948, 959]);
  * feeds are no longer maintained, leaving the SixFlags class emitting all-
  * CLOSED garbage.
  *
- * Between 2026-04-06 and 2026-05-14, Six Flags divested seven parks
- * (including Valleyfair) to EPR Properties under 40-year operating
- * leases. Six are operated by Enchanted Parks (WF, MA, VF, GV, SFSL,
- * SFGE); La Ronde is operated by La Ronde Operations under Premier Parks
- * LLC. Replacement destination classes live under
- * `src/parks/enchantedparks/` but only the three parks whose
- * enchantedparks.com subdomains are live (WF, MA, VF) have subclasses
- * today — the remaining three plus La Ronde are excluded with no source
- * until their subdomains / a replacement become available.
+ * Between 2026-04-06 and 2026-05-14, Six Flags divested seven parks to
+ * EPR Properties under 40-year operating leases. Six are operated by
+ * Enchanted Parks (WF, MA, VF, GV, SFSL, SFGE); La Ronde is operated by
+ * La Ronde Operations Inc., a Premier Parks LLC subsidiary that also
+ * runs Calypso and Valcartier. Replacement destination classes live
+ * under `src/parks/enchantedparks/`.
  *
  * - 6   / WF:   Worlds of Fun         → enchantedparks/worldsoffun
  * - 12  / MA:   Michigan's Adventure  → enchantedparks/michigansadventure
  * - 14  / VF:   Valleyfair            → enchantedparks/valleyfair
  * - 27  / GV:   Schlitterbahn Galv.   → no source yet (subdomain not live)
- * - 903 / SFSL: Six Flags St. Louis   → no source yet (subdomain not live)
+ * - 903 / SFSL: Six Flags St. Louis   → enchantedparks/midamericaparks
  * - 924 / SFGE: Six Flags Great Esc.  → no source yet (subdomain not live)
- * - 969 / SFLR: La Ronde              → divested to La Ronde Operations
+ * - 969 / SFLR: La Ronde              → no primary source distinct from
+ *                                       the Six Flags app; Premier Parks
+ *                                       has no shared guest-experience
+ *                                       platform with wait times
  */
 const EXCLUDED_PARK_IDS = new Set<number>([6, 12, 14, 27, 903, 924, 969]);