feat: implement Phase 3 Experience & Usability (BUNDLES.md, README collections, Risk column) [skip ci]

docs/BUNDLES.md

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+# 📦 Antigravity Skill Bundles
+
+Don't know where to start? Pick a bundle below to get a curated set of skills for your role.
+
+## 🚀 The "Essentials" Starter Pack
+
+_For everyone. Install these first._
+
+- `concise-planning`: Always start with a plan.
+- `lint-and-validate`: Keep your code clean automatically.
+- `git-pushing`: Save your work safely.
+- `kaizen`: Continuous improvement mindset.
+
+## 🛡️ The "Security Engineer" Pack
+
+_For pentesting, auditing, and hardening._
+
+- `ethical-hacking-methodology`: The Bible of ethical hacking.
+- `burp-suite-testing`: Web vulnerability scanning.
+- `owasp-top-10`: Check for the most common flaws.
+- `linux-privilege-escalation`: Advanced Linux security assessment.
+- `cloud-penetration-testing`: AWS/Azure/GCP security.
+
+## 🌐 The "Web Wizard" Pack
+
+_For building modern, high-performance web apps._
+
+- `frontend-design`: UI guidelines and aesthetics.
+- `react-patterns`: Best practices for React (if available).
+- `tailwind-mastery`: Styling superpowers.
+- `form-cro`: Optimize your forms for conversion.
+- `seo-audit`: Get found on Google.
+
+## 🤖 The "Agent Architect" Pack
+
+_For building AI systems._
+
+- `agent-evaluation`: Test your agents.
+- `langgraph`: Build stateful agent workflows.
+- `mcp-builder`: Create your own tools.
+- `prompt-engineering`: Master the art of talking to LLMs.
+
+---
+
+_To use a bundle, simply copy the skill names into your `.agent/skills` folder or use them with your agent._