Add Skyvern skill package, CLI commands, and setup commands (#4817)

skyvern/cli/skills/README.md

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+# Skyvern Skills Package
+
+AI-powered browser automation skill for coding agents. Bundled with `pip install skyvern`.
+
+## Quick Start
+
+```bash
+pip install skyvern
+export SKYVERN_API_KEY="YOUR_KEY"   # get one at https://app.skyvern.com
+```
+
+The skill teaches CLI commands via `skyvern <command>` invocations. For richer
+AI-coding-tool integration, run `skyvern setup claude-code --project` to enable
+MCP (Model Context Protocol) with auto-tool-calling.
+
+## What's Included
+
+A single `skyvern` skill covering all browser automation capabilities:
+
+- Browser session lifecycle (create, navigate, close)
+- AI actions: act, extract, validate, screenshot
+- Precision primitives: click, type, hover, scroll, select, press-key, wait
+- One-off tasks with run-task
+- Credential management and secure login flows
+- Workflow CRUD, execution, monitoring, and cancellation
+- Block schema discovery and validation
+- Debugging with screenshot + validate loops
+
+## Structure
+
+```
+skyvern/
+  SKILL.md              Main skill file (CLI-first, all capabilities)
+  references/           17 deep-dive reference files
+  examples/             Workflow JSON examples
+```
+
+## Install to a Project
+
+```bash
+# Copy skill files to your project
+skyvern skill copy --output .claude/skills
+skyvern skill copy --output .agents/skills
+```
+
+## Validate
+
+```bash
+python scripts/validate_skills_package.py
+```