chore(timetable): bump phpstan baseline for park-path engagement access

Single-count drift: the new park-path explicit activity entry in
LaneCascadeService accesses $parked->engagement?->organisation_id
(same shape as the existing schedule-path access, which the baseline
already accepts). Baseline grew 1740 → 1741 errors; same-shape, no
novel rule.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

api/phpstan-baseline.neon

@@ -6015,7 +6015,7 @@ parameters:
 		-
 			message: '#^Access to an undefined property Illuminate\\Database\\Eloquent\\Model\:\:\$organisation_id\.$#'
 			identifier: property.notFound
-			count: 1
+			count: 2
 			path: app/Services/Artist/LaneCascadeService.php
 
 		-