v1.9.4 - Maintenance Release

Maintenance release with bug fixes and documentation corrections.

Bug Fixes

• SEP-08: Fix RegulatedAssetsService constructor not assigning $tomlData to public property
• SEP-08: Fix TypeError when approval server omits optional action_method field (now defaults to GET per spec)
• SEP-08: Fix RegulatedAssetsService constructor rejecting explicit $network parameter
• SEP-30: Make identity role nullable in SEP30ResponseIdentity to match spec
• Soroban: Fix needsNonInvokerSigningBy() throwing on non-invoke operations (e.g. RestoreFootprintOperation)

Documentation

• Fix SEP38Asset PHPDoc type for $buyDeliveryMethods
• Add deposit-exchange and withdrawal-exchange to SEP24Transaction::$kind docstring
• Correct SEP-06 funding_method deprecation note to reflect actual SDK support
• Remove incorrect base64_encode() from SEP-09 file upload examples
• Fix WebAuthForContracts::setUseFormUrlEncoded() docblock stating wrong default
• Fix WebAuthForContracts::jwtToken() callback signature PHPDoc

Other

• Switch README badges from Poser to Shields.io