- Add NativeNotificationContentFetcher interface for host app implementations
- Add FetchContext class to pass fetch parameters (trigger, scheduledTime, fetchTime)
- Add SchedulingPolicy class for retry backoff configuration
- Add TypeScript definitions for content fetcher SPI in src/definitions.ts
- Export SPI types from src/index.ts
This enables host apps to provide their own content fetching implementation
for background workers, following the Integration Point Refactor (PR2).
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