Initialize Breez SDK and Lightning Node

[CodeByMAB]

Epic Reference

Part of Epic: Breez SDK Integration for Expo App (epic:97fd7dcb-10ec-46a8-b681-b2805eb0eb56)
SRS Spec: spec:97fd7dcb-10ec-46a8-b681-b2805eb0eb56/a8f8bef7-d1c5-4113-a9ad-6092120bfe76

Overview

Initialize and configure the Breez SDK (Spark implementation) on wallet startup. Connect with API key, network (testnet/mainnet), and working directory. Register event listeners and handle connection state.

Related SRS Requirements: FR-SDK-001, FR-SDK-002, Section 7.3–7.5

Tasks

• Load SDK config: apiKey, network (bitcoin/testnet), workingDir, optional inviteCode
• Implement initialization sequence: check existing wallet → connect(config) or generate mnemonic → connect
• Register event listeners: paymentReceived, paymentSent, paymentFailed, channelOpened, channelClosed, syncComplete, nodeStateChanged
• Ensure UI updates within 500ms of events; persist events for debugging
• Handle SDK init failures with retry (exponential backoff)
• Persist SDK state across app restarts
• Clean up listeners on SDK disconnect

Acceptance Criteria

• AC-SDK-001-01: SDK initializes with valid API key
• AC-SDK-001-02: SDK connects to appropriate network (testnet/mainnet)
• AC-SDK-001-03: SDK initialization completes within 10 seconds
• AC-SDK-001-04: System handles SDK initialization failures gracefully
• AC-SDK-001-05: SDK state is persisted across app restarts
• AC-SDK-002-01 to 05: All SDK events registered; payment events update UI in 500ms; channel/sync/error events handled

Diagram (SRS 7.3.2)

sequenceDiagram
    participant App
    participant SDK
    participant Storage
    participant BreezAPI
    
    App->>Storage: Check for existing wallet
    Storage-->>App: Wallet exists/not exists
    
    alt Wallet exists
        App->>SDK: connect(config)
        SDK->>Storage: Load wallet data
        SDK->>BreezAPI: Authenticate
        BreezAPI-->>SDK: Session token
        SDK->>SDK: Sync state
        SDK-->>App: Connected
    else New wallet
        App->>SDK: generateMnemonic()
        SDK-->>App: Mnemonic phrase
        App->>Storage: Store encrypted mnemonic
        App->>SDK: connect(config)
        SDK->>BreezAPI: Register new node
        BreezAPI-->>SDK: Node credentials
        SDK-->>App: Connected
    end

Loading

Dependencies

• Setup Expo Project with Breez SDK Integration #1 Setup Expo Project with Breez SDK Integration
• Implement Wallet Creation and Restoration #2 Implement Wallet Creation and Restoration

---

Ticket ID: ticket:97fd7dcb-10ec-46a8-b681-b2805eb0eb56/60a202ea-26a2-4df7-91ae-4b37b9fc6f1d

[traycerai]

Plan

Observations

This is a greenfield Expo-based Bitcoin Lightning wallet using Breez SDK Spark (nodeless architecture). The SRS provides detailed specifications for SDK initialization (FR-SDK-001) and event handling (FR-SDK-002). The system requires initialization within 10 seconds, event processing within 500ms, and persistent state across app restarts. Dependencies on tickets #1 (Expo setup) and #2 (wallet creation/restoration) indicate the basic project structure and wallet management will be in place.

Approach

The implementation follows a service-oriented architecture with a dedicated SDK manager that handles initialization, connection lifecycle, and event propagation. The approach separates concerns: configuration management, SDK lifecycle, event handling, state persistence, and error recovery. This aligns with the SRS requirements for exponential backoff retry logic, event persistence for debugging, and UI updates within 500ms. The plan leverages React Native's event emitter pattern for decoupled UI updates and uses the storage architecture defined in section 9.2 of the SRS.

Implementation Steps

1. SDK Configuration Management

Create a configuration service to manage SDK initialization parameters:

File: file:src/services/sdk/config.ts

• Define TypeScript interfaces for BreezSDKConfig matching SRS section 7.3.1 parameters: apiKey, network (bitcoin/testnet), workingDir, optional inviteCode
• Implement configuration loader that reads from environment variables or secure storage
• Provide network selection logic (testnet/mainnet) based on user settings stored in AsyncStorage (network_selection key per section 9.3.3)
• Set working directory paths: iOS Application Support/wavespace-wallet/breez-sdk/, Android /data/data/com.wavespace.wallet/files/breez-sdk/ (per section 9.3.4)
• Validate API key presence and format before initialization
• Export configuration factory function that returns validated config object

2. SDK Service Core Implementation

Create the main SDK service that manages the Breez SDK lifecycle:

File: file:src/services/sdk/BreezSDKService.ts

• Import @breeztech/breez-sdk-spark-react-native package
• Implement singleton pattern to ensure single SDK instance
• Define SDK connection states: disconnected, connecting, connected, syncing, error
• Create initialization method following sequence diagram in SRS 7.3.2:
  • Check for existing wallet via storage service (from ticket Implement Wallet Creation and Restoration #2)
  • If wallet exists: call connect(config) with configuration
  • If new wallet: call generateMnemonic(), store encrypted mnemonic via secure storage, then connect(config)
• Implement connection timeout of 10 seconds (AC-SDK-001-03)
• Track initialization start time and emit timeout error if exceeded
• Store SDK instance reference for subsequent operations
• Expose methods: initialize(), disconnect(), getNodeState(), isConnected()

3. Event Listener Registration

Implement comprehensive event handling per FR-SDK-002:

File: file:src/services/sdk/eventHandlers.ts

• Register all required event listeners from SRS 7.4.1:
  • paymentReceived: Update balance, trigger notification, persist to transactions table
  • paymentSent: Update balance, show confirmation, persist to transactions table
  • paymentFailed: Log error details, display user-friendly message, enable retry
  • channelOpened: Update channels table, show notification
  • channelClosed: Update channels table, show notification
  • syncComplete: Update lastSyncedAt timestamp, mark UI as synced
  • nodeStateChanged: Update connection status, refresh node info
• Implement event emitter pattern using React Native's EventEmitter or custom pub/sub
• Ensure asynchronous event processing (section 7.4.2)
• Add event persistence to SQLite for debugging (transactions table per section 9.3.2)
• Implement cleanup method to remove all listeners on SDK disconnect
• Add event timestamp tracking to measure UI update latency (must be <500ms per AC-SDK-002-02)

4. State Persistence Layer

Implement SDK state persistence across app restarts (AC-SDK-001-05):

File: file:src/services/sdk/persistence.ts

• Create state serialization for NodeState model (section 9.1.4)
• Store last known state in AsyncStorage with key sdk_node_state
• Persist connection status, last sync timestamp, network selection
• Implement state restoration on app startup before SDK initialization
• Update state on syncComplete and nodeStateChanged events
• Store SDK working directory path for consistent initialization
• Handle state migration if SDK version changes (section 7.9)

5. Error Handling and Retry Logic

Implement robust error handling per SRS 7.6:

File: file:src/services/sdk/errorHandler.ts

• Define error type mappings from SDK errors to user-friendly messages (table in section 7.6.1)
• Implement exponential backoff retry strategy:
  • Initial delay: 1 second
  • Max retries: 3 attempts
  • Backoff multiplier: 2x (1s, 2s, 4s)
• Wrap all SDK calls in try-catch blocks
• Log errors with context: operation name, parameters, timestamp, stack trace
• Categorize errors: NetworkError, InsufficientFunds, InvoiceExpired, RouteNotFound, InvalidInput, LspError
• Implement recovery actions per error type (section 7.6.1)
• Emit error events to UI layer for user notification
• Track critical errors for error reporting service integration

6. SDK Initialization Hook

Create React hook for component integration:

File: file:src/hooks/useBreezSDK.ts

• Implement custom React hook that wraps BreezSDKService
• Expose SDK state: isInitializing, isConnected, isSyncing, error
• Provide initialization trigger on component mount
• Subscribe to SDK events and update local state
• Return node state, balance information, connection status
• Handle cleanup on component unmount
• Implement loading states for UI feedback during 10-second initialization window

7. Storage Integration

Connect SDK service with storage layers:

File: file:src/services/storage/sdkStorage.ts

• Interface with secure storage (iOS Keychain/Android Keystore) for mnemonic retrieval
• Use SQLite database for event history persistence (transactions table schema in section 9.3.2)
• Implement AsyncStorage operations for SDK state caching
• Ensure encryption for sensitive data (AES-256-GCM per section 9.3.1)
• Create database migrations for transactions and channels tables
• Implement cleanup for old event logs (30-day retention per section 9.4.3)

8. Network State Monitoring

Implement network connectivity monitoring:

File: file:src/services/sdk/networkMonitor.ts

• Use @react-native-community/netinfo to monitor connectivity
• Detect network state changes (online/offline)
• Trigger SDK reconnection on network restoration
• Implement offline mode when network unavailable (section 7.6.2)
• Cache last known state for offline viewing
• Queue operations during offline periods for retry when online
• Display network status indicator in UI

9. Performance Monitoring

Add performance tracking for SDK operations:

File: file:src/services/sdk/performance.ts

• Track initialization time (must be <10 seconds per section 7.8)
• Measure event processing latency (must be <500ms for UI updates)
• Monitor SDK memory usage (must be <100MB per section 7.8)
• Track database size (must be <200MB per section 7.8)
• Log performance metrics for debugging
• Implement alerts if thresholds exceeded
• Expose performance data for monitoring dashboard

10. Integration with Wallet Service

Connect SDK service with wallet management from ticket #2:

File: file:src/services/wallet/walletService.ts (modify existing)

• Import BreezSDKService singleton
• Trigger SDK initialization after wallet creation/restoration
• Pass mnemonic from wallet service to SDK initialization
• Coordinate wallet state with SDK state
• Handle wallet reset by disconnecting SDK and clearing state
• Implement wallet lock/unlock with SDK connection management

11. UI State Management

Integrate SDK state with application state management:

File: file:src/store/sdkSlice.ts (if using Redux) or file:src/context/SDKContext.tsx (if using Context API)

• Create state slice/context for SDK connection status
• Store node state, balance, sync status
• Subscribe to SDK events and update global state
• Ensure UI updates within 500ms of events (AC-SDK-002-02)
• Provide selectors for connection status, balance, sync progress
• Handle loading and error states for UI components

12. Initialization Flow Orchestration

Coordinate the complete initialization sequence:

File: file:src/services/sdk/initializationOrchestrator.ts

• Implement startup sequence per diagram in SRS 7.3.2:
  1. Load configuration from config service
  2. Check storage for existing wallet
  3. If exists: load mnemonic and call SDK connect
  4. If new: generate mnemonic, store securely, call SDK connect
  5. Register all event listeners
  6. Wait for connection confirmation
  7. Trigger initial sync
  8. Update persisted state
• Add timeout handling (10-second limit)
• Implement graceful degradation if initialization fails
• Provide retry mechanism with exponential backoff
• Emit initialization progress events for UI feedback

sequenceDiagram
    participant App
    participant Orchestrator
    participant Config
    participant Storage
    participant SDK
    participant EventHandlers
    participant BreezAPI

    App->>Orchestrator: initialize()
    Orchestrator->>Config: loadConfig()
    Config-->>Orchestrator: SDKConfig
    
    Orchestrator->>Storage: checkExistingWallet()
    Storage-->>Orchestrator: walletExists
    
    alt Wallet Exists
        Orchestrator->>Storage: loadMnemonic()
        Storage-->>Orchestrator: encryptedMnemonic
        Orchestrator->>SDK: connect(config, mnemonic)
    else New Wallet
        Orchestrator->>SDK: generateMnemonic()
        SDK-->>Orchestrator: mnemonic
        Orchestrator->>Storage: storeEncryptedMnemonic()
        Orchestrator->>SDK: connect(config, mnemonic)
    end
    
    SDK->>BreezAPI: authenticate()
    BreezAPI-->>SDK: sessionToken
    
    SDK->>SDK: syncState()
    
    Orchestrator->>EventHandlers: registerAllListeners()
    EventHandlers->>SDK: addEventListener(...)
    
    SDK-->>Orchestrator: connected
    Orchestrator->>Storage: persistSDKState()
    Orchestrator-->>App: initializationComplete

Loading

13. Testing Utilities

Create testing helpers for SDK integration:

File: file:src/services/sdk/__tests__/mockSDK.ts

• Implement mock Breez SDK for unit testing
• Create test fixtures for SDK events
• Provide helper functions to simulate event emissions
• Mock network conditions (online/offline)
• Create test scenarios for initialization success/failure
• Implement performance test helpers

14. Documentation

Document SDK integration for team:

File: file:docs/SDK_INTEGRATION.md

• Document initialization flow and configuration
• Provide examples of event handling
• Explain error handling strategies
• Document state persistence approach
• Include troubleshooting guide for common issues
• Add performance optimization tips
• Reference SRS sections for detailed requirements

Acceptance Criteria Validation

AC-SDK-001-01 (API Key): Configuration service validates API key presence before initialization

AC-SDK-001-02 (Network): Config service supports testnet/mainnet selection from user settings

AC-SDK-001-03 (10-second timeout): Initialization orchestrator implements timeout with error emission

AC-SDK-001-04 (Failure handling): Error handler implements exponential backoff retry with user-friendly messages

AC-SDK-001-05 (State persistence): Persistence layer stores SDK state in AsyncStorage, restored on app restart

AC-SDK-002-01 (Event registration): Event handlers register all 7 required events on initialization

AC-SDK-002-02 (500ms UI updates): Event emitter pattern ensures immediate state updates, performance monitor tracks latency

AC-SDK-002-03 (Channel notifications): Channel event handlers trigger notification system

AC-SDK-002-04 (Sync updates): syncComplete event updates wallet state and UI

AC-SDK-002-05 (Error logging): Error handler logs all errors with context and displays to user

Import In IDE

🤖 Prompt for AI Agents

## Observations

This is a greenfield Expo-based Bitcoin Lightning wallet using Breez SDK Spark (nodeless architecture). The SRS provides detailed specifications for SDK initialization (FR-SDK-001) and event handling (FR-SDK-002). The system requires initialization within 10 seconds, event processing within 500ms, and persistent state across app restarts. Dependencies on tickets #1 (Expo setup) and #2 (wallet creation/restoration) indicate the basic project structure and wallet management will be in place.

## Approach

The implementation follows a service-oriented architecture with a dedicated SDK manager that handles initialization, connection lifecycle, and event propagation. The approach separates concerns: configuration management, SDK lifecycle, event handling, state persistence, and error recovery. This aligns with the SRS requirements for exponential backoff retry logic, event persistence for debugging, and UI updates within 500ms. The plan leverages React Native's event emitter pattern for decoupled UI updates and uses the storage architecture defined in section 9.2 of the SRS.

## Implementation Steps

### 1. SDK Configuration Management

Create a configuration service to manage SDK initialization parameters:

**File:** `file:src/services/sdk/config.ts`

- Define TypeScript interfaces for `BreezSDKConfig` matching SRS section 7.3.1 parameters: `apiKey`, `network` (bitcoin/testnet), `workingDir`, optional `inviteCode`
- Implement configuration loader that reads from environment variables or secure storage
- Provide network selection logic (testnet/mainnet) based on user settings stored in AsyncStorage (`network_selection` key per section 9.3.3)
- Set working directory paths: iOS `Application Support/wavespace-wallet/breez-sdk/`, Android `/data/data/com.wavespace.wallet/files/breez-sdk/` (per section 9.3.4)
- Validate API key presence and format before initialization
- Export configuration factory function that returns validated config object

### 2. SDK Service Core Implementation

Create the main SDK service that manages the Breez SDK lifecycle:

**File:** `file:src/services/sdk/BreezSDKService.ts`

- Import `@breeztech/breez-sdk-spark-react-native` package
- Implement singleton pattern to ensure single SDK instance
- Define SDK connection states: `disconnected`, `connecting`, `connected`, `syncing`, `error`
- Create initialization method following sequence diagram in SRS 7.3.2:
  - Check for existing wallet via storage service (from ticket #2)
  - If wallet exists: call `connect(config)` with configuration
  - If new wallet: call `generateMnemonic()`, store encrypted mnemonic via secure storage, then `connect(config)`
- Implement connection timeout of 10 seconds (AC-SDK-001-03)
- Track initialization start time and emit timeout error if exceeded
- Store SDK instance reference for subsequent operations
- Expose methods: `initialize()`, `disconnect()`, `getNodeState()`, `isConnected()`

### 3. Event Listener Registration

Implement comprehensive event handling per FR-SDK-002:

**File:** `file:src/services/sdk/eventHandlers.ts`

- Register all required event listeners from SRS 7.4.1:
  - `paymentReceived`: Update balance, trigger notification, persist to transactions table
  - `paymentSent`: Update balance, show confirmation, persist to transactions table
  - `paymentFailed`: Log error details, display user-friendly message, enable retry
  - `channelOpened`: Update channels table, show notification
  - `channelClosed`: Update channels table, show notification
  - `syncComplete`: Update `lastSyncedAt` timestamp, mark UI as synced
  - `nodeStateChanged`: Update connection status, refresh node info
- Implement event emitter pattern using React Native's `EventEmitter` or custom pub/sub
- Ensure asynchronous event processing (section 7.4.2)
- Add event persistence to SQLite for debugging (transactions table per section 9.3.2)
- Implement cleanup method to remove all listeners on SDK disconnect
- Add event timestamp tracking to measure UI update latency (must be <500ms per AC-SDK-002-02)

### 4. State Persistence Layer

Implement SDK state persistence across app restarts (AC-SDK-001-05):

**File:** `file:src/services/sdk/persistence.ts`

- Create state serialization for `NodeState` model (section 9.1.4)
- Store last known state in AsyncStorage with key `sdk_node_state`
- Persist connection status, last sync timestamp, network selection
- Implement state restoration on app startup before SDK initialization
- Update state on `syncComplete` and `nodeStateChanged` events
- Store SDK working directory path for consistent initialization
- Handle state migration if SDK version changes (section 7.9)

### 5. Error Handling and Retry Logic

Implement robust error handling per SRS 7.6:

**File:** `file:src/services/sdk/errorHandler.ts`

- Define error type mappings from SDK errors to user-friendly messages (table in section 7.6.1)
- Implement exponential backoff retry strategy:
  - Initial delay: 1 second
  - Max retries: 3 attempts
  - Backoff multiplier: 2x (1s, 2s, 4s)
- Wrap all SDK calls in try-catch blocks
- Log errors with context: operation name, parameters, timestamp, stack trace
- Categorize errors: `NetworkError`, `InsufficientFunds`, `InvoiceExpired`, `RouteNotFound`, `InvalidInput`, `LspError`
- Implement recovery actions per error type (section 7.6.1)
- Emit error events to UI layer for user notification
- Track critical errors for error reporting service integration

### 6. SDK Initialization Hook

Create React hook for component integration:

**File:** `file:src/hooks/useBreezSDK.ts`

- Implement custom React hook that wraps `BreezSDKService`
- Expose SDK state: `isInitializing`, `isConnected`, `isSyncing`, `error`
- Provide initialization trigger on component mount
- Subscribe to SDK events and update local state
- Return node state, balance information, connection status
- Handle cleanup on component unmount
- Implement loading states for UI feedback during 10-second initialization window

### 7. Storage Integration

Connect SDK service with storage layers:

**File:** `file:src/services/storage/sdkStorage.ts`

- Interface with secure storage (iOS Keychain/Android Keystore) for mnemonic retrieval
- Use SQLite database for event history persistence (transactions table schema in section 9.3.2)
- Implement AsyncStorage operations for SDK state caching
- Ensure encryption for sensitive data (AES-256-GCM per section 9.3.1)
- Create database migrations for transactions and channels tables
- Implement cleanup for old event logs (30-day retention per section 9.4.3)

### 8. Network State Monitoring

Implement network connectivity monitoring:

**File:** `file:src/services/sdk/networkMonitor.ts`

- Use `@react-native-community/netinfo` to monitor connectivity
- Detect network state changes (online/offline)
- Trigger SDK reconnection on network restoration
- Implement offline mode when network unavailable (section 7.6.2)
- Cache last known state for offline viewing
- Queue operations during offline periods for retry when online
- Display network status indicator in UI

### 9. Performance Monitoring

Add performance tracking for SDK operations:

**File:** `file:src/services/sdk/performance.ts`

- Track initialization time (must be <10 seconds per section 7.8)
- Measure event processing latency (must be <500ms for UI updates)
- Monitor SDK memory usage (must be <100MB per section 7.8)
- Track database size (must be <200MB per section 7.8)
- Log performance metrics for debugging
- Implement alerts if thresholds exceeded
- Expose performance data for monitoring dashboard

### 10. Integration with Wallet Service

Connect SDK service with wallet management from ticket #2:

**File:** `file:src/services/wallet/walletService.ts` (modify existing)

- Import `BreezSDKService` singleton
- Trigger SDK initialization after wallet creation/restoration
- Pass mnemonic from wallet service to SDK initialization
- Coordinate wallet state with SDK state
- Handle wallet reset by disconnecting SDK and clearing state
- Implement wallet lock/unlock with SDK connection management

### 11. UI State Management

Integrate SDK state with application state management:

**File:** `file:src/store/sdkSlice.ts` (if using Redux) or `file:src/context/SDKContext.tsx` (if using Context API)

- Create state slice/context for SDK connection status
- Store node state, balance, sync status
- Subscribe to SDK events and update global state
- Ensure UI updates within 500ms of events (AC-SDK-002-02)
- Provide selectors for connection status, balance, sync progress
- Handle loading and error states for UI components

### 12. Initialization Flow Orchestration

Coordinate the complete initialization sequence:

**File:** `file:src/services/sdk/initializationOrchestrator.ts`

- Implement startup sequence per diagram in SRS 7.3.2:
  1. Load configuration from config service
  2. Check storage for existing wallet
  3. If exists: load mnemonic and call SDK connect
  4. If new: generate mnemonic, store securely, call SDK connect
  5. Register all event listeners
  6. Wait for connection confirmation
  7. Trigger initial sync
  8. Update persisted state
- Add timeout handling (10-second limit)
- Implement graceful degradation if initialization fails
- Provide retry mechanism with exponential backoff
- Emit initialization progress events for UI feedback

```mermaid
sequenceDiagram
    participant App
    participant Orchestrator
    participant Config
    participant Storage
    participant SDK
    participant EventHandlers
    participant BreezAPI

    App->>Orchestrator: initialize()
    Orchestrator->>Config: loadConfig()
    Config-->>Orchestrator: SDKConfig
    
    Orchestrator->>Storage: checkExistingWallet()
    Storage-->>Orchestrator: walletExists
    
    alt Wallet Exists
        Orchestrator->>Storage: loadMnemonic()
        Storage-->>Orchestrator: encryptedMnemonic
        Orchestrator->>SDK: connect(config, mnemonic)
    else New Wallet
        Orchestrator->>SDK: generateMnemonic()
        SDK-->>Orchestrator: mnemonic
        Orchestrator->>Storage: storeEncryptedMnemonic()
        Orchestrator->>SDK: connect(config, mnemonic)
    end
    
    SDK->>BreezAPI: authenticate()
    BreezAPI-->>SDK: sessionToken
    
    SDK->>SDK: syncState()
    
    Orchestrator->>EventHandlers: registerAllListeners()
    EventHandlers->>SDK: addEventListener(...)
    
    SDK-->>Orchestrator: connected
    Orchestrator->>Storage: persistSDKState()
    Orchestrator-->>App: initializationComplete
```

### 13. Testing Utilities

Create testing helpers for SDK integration:

**File:** `file:src/services/sdk/__tests__/mockSDK.ts`

- Implement mock Breez SDK for unit testing
- Create test fixtures for SDK events
- Provide helper functions to simulate event emissions
- Mock network conditions (online/offline)
- Create test scenarios for initialization success/failure
- Implement performance test helpers

### 14. Documentation

Document SDK integration for team:

**File:** `file:docs/SDK_INTEGRATION.md`

- Document initialization flow and configuration
- Provide examples of event handling
- Explain error handling strategies
- Document state persistence approach
- Include troubleshooting guide for common issues
- Add performance optimization tips
- Reference SRS sections for detailed requirements

## Acceptance Criteria Validation

**AC-SDK-001-01 (API Key):** Configuration service validates API key presence before initialization

**AC-SDK-001-02 (Network):** Config service supports testnet/mainnet selection from user settings

**AC-SDK-001-03 (10-second timeout):** Initialization orchestrator implements timeout with error emission

**AC-SDK-001-04 (Failure handling):** Error handler implements exponential backoff retry with user-friendly messages

**AC-SDK-001-05 (State persistence):** Persistence layer stores SDK state in AsyncStorage, restored on app restart

**AC-SDK-002-01 (Event registration):** Event handlers register all 7 required events on initialization

**AC-SDK-002-02 (500ms UI updates):** Event emitter pattern ensures immediate state updates, performance monitor tracks latency

**AC-SDK-002-03 (Channel notifications):** Channel event handlers trigger notification system

**AC-SDK-002-04 (Sync updates):** `syncComplete` event updates wallet state and UI

**AC-SDK-002-05 (Error logging):** Error handler logs all errors with context and displays to user

---

Execution Information

Branch: main
Commit: 342104b

---

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