Add SchedulerClient to communicate with external scheduler service for
registering volatile prefetch tasks discovered during HybridRAG searches.
- Add scheduler_client.py with full REST API for task CRUD operations
- Add scheduler_url config setting (default: http://scheduler:8090)
- Update consolidation service to use scheduler for prefetch registration
- Add scheduler health checks to startup/shutdown lifecycle
When HybridRAG classifies web content as prefetch-worthy, it now creates
scheduled tasks that periodically refresh the volatile cache via the
external scheduler service.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
