🦓 Zebra

Added

• Implements the Leaf Billing 5 provider contract: resumeSubscription() for grace-period comebacks, and period-end cancellation via the $atPeriodEnd argument
• changeSubscription() swaps a customer's plan on Stripe using the payment method on file, no new checkout session
• Customers are managed through Leaf Billing, so the same code drives any provider

Fixed

• Subscription state checks report correctly, so access gating built on hasActiveSubscription() can be trusted

Changed

• Stripe now requires PHP 8.2+, leafs/billing v5 and stripe/stripe-php ^16, and jumps from v0.2.0 to v5.0 to version alongside the rest of Leaf 5