feat(core): update plugin with generic polling support and monorepo structure

- Update package.json with workspaces configuration for monorepo structure
- Add test:workspaces script for running tests across all packages
- Update src/definitions.ts with enhanced type definitions for generic polling
- Improve src/callback-registry.ts with better error handling and logging
- Enhance src/observability.ts with telemetry budgets and PII redaction
- Update src/typescript/SecurityManager.ts with JWT validation improvements
- Add support for @timesafari/polling-contracts package integration
- Include backward compatibility with existing plugin interfaces
- Improve TypeScript type safety across all core modules
- Add comprehensive error handling and logging throughout

Establishes the foundation for generic polling while maintaining existing functionality.

src/definitions.ts

@@ -478,7 +478,7 @@ export interface PlanSummary {
   locLat?: number;
   locLon?: number;
   url?: string;
-};
+}
 
 // Phase 2: Detailed TimeSafari Notification Types
 export interface TimeSafariNotificationBundle {
@@ -595,13 +595,13 @@ export interface ActiveDidIntegrationConfig {
   storageType: 'plugin-managed' | 'host-managed';
   jwtExpirationSeconds?: number;
   apiServer?: string;
-};
+}
 
 export interface ActiveDidChangeEvent {
   activeDid: string;
   timestamp: number;
   source: 'host' | 'plugin';
-};
+}
 
 // MARK: - Phase 3: TimeSafari Background Coordination Interfaces