Add Zap — skill-first Rust TUI coding agent

[sanjeev23oct]

What

Adds Zap to the Open Source section, sorted by star count (18 ⭐, between Smelt at 23 and Binharic at 16).

Entry

- **[Zap](https://github.com/zap-coding-agent/zap-coding-agent)** `⭐ 18` — Skill-first Rust TUI coding agent that injects only the context your task needs — no system prompt bloat. Single binary, no runtime. Supports Claude, Gemini, OpenAI, and local models via LM Studio; code-indexed via SQLite for fast symbol lookup; MCP support. MIT.

Why it fits

• Terminal-native TUI (Ratatui), reads/edits files, runs shell commands autonomously ✓
• MIT license, active project ✓
• Distinct angle among Rust agents: skill-first context injection (no always-on system prompt), SQLite code index for symbol lookup, LM Studio/local model support — differentiates from Smelt, g3, picocode, QQCode, and Crab Code already in the list