feat: add phantom-canvas skill for Gemini image generation

skills/phantom-canvas/references/AGENTS.md

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+# AGENTS.md
+
+CLI tool and HTTP API for AI image/video generation via Gemini Web.
+
+## What this tool does
+
+Phantom Canvas wraps Gemini Web as a programmable CLI and HTTP API. It launches Chrome via CDP, automates Gemini's web UI, and exposes generation capabilities for AI agents, scripts, and applications.
+
+## How to use
+
+```bash
+bun add -g phantom-canvas       # or: npm install -g phantom-canvas
+phantom-canvas generate "your prompt" -o output.png --headed  # first time: login in Chrome
+phantom-canvas generate "your prompt" -o output.png           # after that: headless
+```
+
+See [SKILL.md](SKILL.md) for complete agent instructions.
+
+## Architecture
+
+- `index.ts` — CLI entry point (chrome / generate / serve)
+- `lib/browser.ts` — Browser automation (Chrome CDP + Playwright)
+- `lib/tasks.ts` — Async task queue
+- `dist/index.js` — Compiled Node.js bundle
+
+## Session
+
+Chrome stores login in `~/.phantom-canvas/chrome-profile/`. First time requires `--headed` to login interactively. After that, login persists and headless mode works.