Add llms.txt to codevetter.com landing.

Curated product links for LLM and agent clients.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: sarthakagrawal927

apps/landing-page-astro/public/llms.txt

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+# CodeVetter
+
+> Desktop-first AI code review workbench for agent-generated code. Local SQLite storage, Tauri shell, evidence-backed review loops — your repo never hits a central server.
+
+Open source (ISC). macOS desktop app with optional Claude, Codex, or Gemini CLI backends.
+
+## Product
+
+- [Home](https://codevetter.com/): Features, pricing, and how it works
+- [Download](https://codevetter.com/download): macOS release and install instructions
+- [Agent PR benchmark](https://codevetter.com/benchmark): Public benchmark plan for measuring AI review catch rate
+- [Privacy](https://codevetter.com/privacy): Local-first data handling and third-party CLI usage
+- [Terms](https://codevetter.com/terms): Terms of use
+
+## Docs
+
+- [README](https://github.com/sarthak-fleet/CodeVetter#readme): Architecture, desktop app setup, and product direction
+- [Releases](https://github.com/sarthak-fleet/CodeVetter/releases): Changelog and binaries
+
+## Optional
+
+- [Foundry](https://sassmaker.com): Parent fleet showcase
+- [Sarthak Agrawal](https://sarthakagrawal.dev): Builder portfolio