nixos: add playwright-cli

dotfiles/agents/skills/playwright-cli/SKILL.md

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+---
+name: playwright-cli
+description: Automate browser interactions from the shell using Playwright via the `playwright-cli` command (open/goto/snapshot/click/type/screenshot, tabs/storage/network). Use when you need deterministic browser automation for web testing, form filling, screenshots/PDFs, or data extraction.
+---
+
+# Browser Automation With playwright-cli
+
+This system provides `playwright-cli` via Nix (see `nixos/overlay.nix` and `nixos/code.nix`), so it’s available on `PATH` without any `npm -g` installs.
+
+## Quick Start
+
+```bash
+# First run (downloads browser bits used by Playwright)
+playwright-cli install-browser
+
+# Open a new browser session (optionally with a URL)
+playwright-cli open
+playwright-cli open https://example.com/
+
+# Navigate, inspect, and interact
+playwright-cli goto https://playwright.dev
+playwright-cli snapshot
+playwright-cli click e15
+playwright-cli type "search query"
+playwright-cli press Enter
+
+# Save artifacts
+playwright-cli screenshot --filename=page.png
+playwright-cli pdf --filename=page.pdf
+
+# Close the browser
+playwright-cli close
+```
+
+## Practical Workflow
+
+1. `playwright-cli open` (or `open <url>`)
+2. `playwright-cli snapshot`
+3. Use element refs (`e1`, `e2`, ...) from the snapshot with `click`, `fill`, `hover`, `check`, etc.
+4. Take `screenshot`/`pdf` as needed
+5. `playwright-cli close`
+
+## Tips
+
+- Use `playwright-cli state-save auth.json` / `state-load auth.json` to persist login state across runs.
+- Use named sessions with `-s=mysession` when you need multiple concurrent browsers.
+- Set `PLAYWRIGHT_CLI_PACKAGE` to pin the npm package (default is `@playwright/cli@latest`).

dotfiles/agents/skills/playwright-cli/agents/openai.yaml

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+interface:
+  display_name: "Playwright CLI"
+  short_description: "Automate browser interactions"
+  default_prompt: "Use playwright-cli to automate browser actions (open/goto/snapshot/click/type/screenshot) and save useful artifacts (screenshots, PDFs, auth state)."
+