Reduce DB polling overhead for native workers by batch-fetching jobs
server-side and serving them from an in-memory buffer via HTTP.
- Add batch_pull() in windmill-queue: single SELECT...FOR UPDATE SKIP LOCKED LIMIT N
- Add batch pull SQL helpers (make_batch_pull_query, format_batch_pull_query)
- OSS stubs for agent-workers accept batch_buffer parameter (4-tuple return)
- Native workers self-sign JWT and pull jobs via HTTP when co-located with server
- Add uses_batch_http_pull column to worker_ping for server-side tracking
- Worker pull loop: HTTP batch pull when client available, SQL otherwise
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>