2.5.3

• feat: Forward additional fields to PIS Connect meta payload (psu_phone_prefix, custom for reconciliation data, target_env)
• feat: Support flat psu_address_* fields in PIS Connect config (auto-assembled into meta.psu_address when nested psu_address is not provided)
• chore: Expand IPisSetup and IMeta interfaces to declare newly typed optional fields (including pre-existing expiry which was forwarded at runtime but missing from IPisSetup)
• chore: Switch CHANGELOG version headings to H2 per Keep-a-Changelog
• test: Add offline unit tests for Connect._buildPaymentPayload covering existing and new opt-in fields