Add HoverStare to Automated PR Agents

[liuchong]

Adds HoverStare to the Automated PR Agents section.

HoverStare is an open-source (1PL) AI code review bot written in Rust. It stands out in this list for a few things that fit the section's theme well:

• Repo-aware review: the reviewing model gets read-only repo tools (read_file / grep / glob / show_base_file) and verifies suspicions against the actual codebase before reporting — catching bugs that hide outside the diff (e.g. a changed function whose callers break elsewhere)
• Multi-pass voting + verifier: three independent review passes vote on findings; lone-vote findings must survive an independent verifier pass — directly addressing the false-positive problem noted in the list's research section
• Three deployment shapes: GitHub Action, GitHub App, or self-hostable webhook service (open source, so teams can run it anywhere)
• BYOK: works with Anthropic or any OpenAI-compatible endpoint (Kimi, DeepSeek, OpenRouter) — no vendor lock-in

It's also already battle-tested: running with required status checks on a private production repo (Intent-SDK).

Happy to adjust wording or placement if you'd like.