KarpelesLab / libwallet / 24342688199

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add Dart package with FFI transport for direct Go↔Dart communication

Adds a pure Dart client package (dart/) that communicates with the Go
library via direct FFI function calls using NativeCallable.listener
for Go→Dart callbacks. This eliminates the Unix socket transport that
would disconnect when apps go to background on iOS/Android.

Go side (cshared/ffi.go):
- LibwalletInit, LibwalletRequest, LibwalletSetEventCallback, LibwalletDestroy
- Async request handling via goroutines with progress callback support
- Event forwarding via MakeJsonSocketFD internal bridge

Dart side (dart/lib/):
- Transport abstraction with FfiTransport (preferred) and JsonRpcConnection (fallback)
- Typed API covering all endpoints: Wallet, Account, Network, Transaction, etc.
- 15 model classes matching Go struct JSON serialization
- Sealed event classes with Stream-based delivery
- Native asset hook (hook/build.dart) for pub.dev binary distribution

Tests: 48 passing (33 unit + 9 socket integration + 6 FFI integration)
CI: dart-test.yml with host, iOS simulator, and Android emulator jobs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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