[bug] 100% CPU usage without serving requests

### Component

not sure

### What happened?

Even when not seeing an active job being processed for a while, it seems the Darkbloom process continuously uses 100% cpu, which in general seems to be unnecessary. Likely some infinite loop in a process somewhere.

### Expected behavior

Expecting perhaps 10% on one core for polling here and there, thermals to go almost idle if/when little to serve.

### Steps to reproduce

1. run `darkbloom start`
2. See cpu go to 100% on the process
3. view the web UI/provider dashboard
4. No requests being processed
5. Still continuously see 100% cpu on the Darbloom process

### Environment

version 0.6.10
MacOS 26.4.1 (25E253)

### Logs

```shell

```

### Confirmations

- [x] I searched existing issues and this isn't a duplicate

Start by running `darkbloom start` on the reported environment and observe the process while no requests are being served. Compare CPU usage with the web UI/provider dashboard idle, then identify the responsible component or loop. Done means idle Darkbloom uses substantially less CPU without affecting request serving.

Written by the indexing model from the issue text.