feat(skills): add quickstart onboarding skill

[mlbrilliance]

Summary

• Adds a single new skill file .claude/skills/quickstart/SKILL.md — an interactive onboarding concierge for new users
• Auto-activates on natural language like "get started", "how do I use this", "which command should I use"
• Routes beginners to the right command, workflow, or swarm topology with copy-pasteable examples
• Covers first-time setup, intent routing, concept clarification, and troubleshooting

Motivation

Directly addresses:

• How do I use this? Paradox of choice and confusion as a beginner #1196 — "Paradox of choice and confusion as a beginner" (user overwhelmed by 35+ commands and 38 skills)
• How to use ruflo #1251 — "How to use ruflo" (user installed but didn't know what to do next)

Both issues describe the same core problem: new users don't know where to start. This skill leverages the existing autodiscovery system to catch beginner intent and map it to the right workflow — no new CLI code required.

Scope

• 1 new file added: .claude/skills/quickstart/SKILL.md
• 0 files modified — no changes to CLI source, README, branding, defaults, or existing skills
• Follows existing skill format conventions (YAML frontmatter, progressive disclosure, troubleshooting section)

Test plan

• Verify skill file loads correctly in Claude Code session
• Confirm auto-activation on trigger phrases ("get started", "new to ruflo", "how do I use this")
• Confirm negative triggers don't activate (users already running swarms, specific CLI errors)
• Validate all referenced commands match current CLI interface

🤖 Generated with Claude Code

[mlbrilliance]

This would be a nice feature for new users!