Add exponential backoff retry to GitHub webhook delivery

When WorkProtocol sends webhook notifications to GitHub (PR comments, status checks), transient failures silently drop the notification. Implement exponential backoff retry with jitter for failed webhook deliveries. Store failed attempts in the database and retry up to 3 times with 1s, 4s, 16s delays.

Requirements

Acceptance Criteria

[
  "Failed webhook deliveries are stored in a retry queue table",
  "Retry logic uses exponential backoff with jitter (base 2, max 3 retries)",
  "A cron endpoint /api/cron/retry-webhooks processes the queue",
  "Successfully retried webhooks are marked as delivered",
  "Permanently failed webhooks (3+ attempts) are marked as dead-letter",
  "Unit tests cover retry logic and backoff calculation"
]

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