Show HN: I built a native macOS Markdown viewer 100% with AI coding agents

I built Markdown Viewer because every Markdown app I found was either bloated (VS Code, Obsidian) or too bare-bones. Wanted something that loads instantly, renders Obsidian-style features cleanly, and weighs in at a few megabytes.Built with Tauri 2 (Rust backend + webview frontend):
- GitHub Flavored Markdown + Obsidian extensions (wikilinks, callouts, emoji, math, Mermaid diagrams)
- Frontmatter rendered as a structured metadata bar above content
- HTML sanitization via ammonia for security
- No heavy dependencies, no ElectronWhat makes it interesting isn't so much the features — but how it was built. Every line of Rust, CSS, and JavaScript was written by AI coding agents (pi.dev/Qwen and Claude Code) without a single human writing code. No hand-holding, no "prompt then copy-paste" — just a high-level brief and iterative agent-driven development.I've been using this project to hone into my pi.dev setup - am getting somewhere with pi.dev/Qwen3.6 with a small set of extensions. Trying to avoid Claude Code/Opus for this project - want to see what I can do with local LLM.Key stats:
- Instant load (no webview overhead, pure rendering)
- ~few MB binary
- Sanitized HTML via ammonia (XSS-safe)
- Open source on GitHubOpen source at https://github.com/rajatarya/mdviewer