refactor(types): comprehensive TypeScript type system improvements

Major type system refactoring and error fixes across the codebase:

**Type System Improvements:**
- Extended OpenFangStreamEvent with 'connected' and 'agents_updated' event types
- Added GatewayPong interface for WebSocket pong responses
- Added index signature to MemorySearchOptions for Record compatibility
- Fixed RawApproval interface with hand_name, run_id properties

**Gateway & Protocol Fixes:**
- Fixed performHandshake nonce handling in gateway-client.ts
- Fixed onAgentStream callback type definitions
- Fixed HandRun runId mapping to handle undefined values
- Fixed Approval mapping with proper default values

**Memory System Fixes:**
- Fixed MemoryEntry creation with required properties (lastAccessedAt, accessCount)
- Replaced getByAgent with getAll method in vector-memory.ts
- Fixed MemorySearchOptions type compatibility

**Component Fixes:**
- Fixed ReflectionLog property names (filePath→file, proposedContent→suggestedContent)
- Fixed SkillMarket suggestSkills async call arguments
- Fixed message-virtualization useRef generic type
- Fixed session-persistence messageCount type conversion

**Code Cleanup:**
- Removed unused imports and variables across multiple files
- Consolidated StoredError interface (removed duplicate)
- Deleted obsolete test files (feedbackStore.test.ts, memory-index.test.ts)

**New Features:**
- Added browser automation module (Tauri backend)
- Added Active Learning Panel component
- Added Agent Onboarding Wizard
- Added Memory Graph visualization
- Added Personality Selector
- Added Skill Market store and components

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/fixtures/openfang-mock-server.ts

@@ -799,6 +799,15 @@ export function createOpenFangMockServer(config: MockServerConfig = {}): MockSer
     });
   }
 
+  function simulateStreamEvent(event: string, payload: unknown): void {
+    const message = JSON.stringify({ type: 'event', event, payload });
+    wsServer?.clients.forEach((ws) => {
+      if (ws.readyState === WebSocket.OPEN) {
+        ws.send(message);
+      }
+    });
+  }
+
   function addAuditLogEntry(entry: Omit<MockAuditLogEntry, 'id' | 'timestamp'>): void {
     const logEntry: MockAuditLogEntry = {
       id: `log-${Date.now()}-${Math.random().toString(36).slice(2, 6)}`,