0.86.0

With `--log-level=debug`, each phase of a run now prints how long it took, so non-AI time can be broken down from a CI log.

## Per-Phase Timings in Debug Logs (#451)

```
D: [timing] agent.initializers 15879ms
D: [timing] step.screenshot 105ms
D: [timing] step.executeAction 2470ms
D: [timing] device.waitForAppToSettle 5849ms
```

Covers connection, initializers, steps and their phases, and device calls. Default output does not change.

## What's Changed
* Log per-phase timings for steps, initializers and device calls by @takahirom in https://github.com/takahirom/arbigent/pull/451


**Full Changelog**: https://github.com/takahirom/arbigent/compare/0.85.0...0.86.0