Add HoverStare to Continuous Code Review

[liuchong]

Adds HoverStare to the Continuous Code Review section.

HoverStare is an open-source (1PL) AI code review bot written in Rust that fits the continuous-AI model directly — it runs continuously on every PR push:

• Continuous + incremental: each new commit gets a delta review; previously reported findings are tracked across commits and auto-resolved when fixed (with a "confirmed fixed" marker fallback)
• Repo-aware: the reviewing agent has read-only repo tools (read_file / grep / glob / show_base_file) and does targeted verification before reporting, rather than judging the diff in isolation
• Low-noise by design: multi-pass voting plus an independent verifier pass for lone-vote findings
• Open source & self-hostable: runs as a GitHub Action, a GitHub App, or a self-hosted webhook service; BYOK (Anthropic or any OpenAI-compatible endpoint)