feat(commands): add /compound-engineering-setup for configurable agents

[kieranklaassen]

Summary

• Adds /compound-engineering-setup command for configuring review agents per project
• Updates workflows to read agents from .claude/compound-engineering.json config instead of hardcoding
• Supports Quick, Advanced, and Minimal setup modes with multi-step onboarding

Problem

Review agents were hardcoded in multiple workflow files (/workflows:review, /plan_review, /slfg, etc.), making it difficult for users to customize which agents run during code review.

Solution

Created a configuration system that:

1. New /compound-engineering-setup command - Interactive setup with:

   • Project type auto-detection (Rails, Python, TypeScript, etc.)
   • Three setup modes: Quick (defaults), Advanced (manual), Minimal
   • Uses AskUserQuestion for multi-step onboarding
   • Writes to .claude/compound-engineering.json

2. Config file format:

{
  "projectType": "rails",
  "reviewAgents": ["kieran-rails-reviewer", "code-simplicity-reviewer", "security-sentinel"],
  "planReviewAgents": ["kieran-rails-reviewer", "code-simplicity-reviewer"],
  "conditionalAgents": {
    "migrations": ["data-migration-expert", "deployment-verification-agent"]
  }
}

3. Updated workflows to read from config:
   • /workflows:review - uses reviewAgents array
   • /plan_review - uses planReviewAgents array
   • /workflows:work - references config for optional reviewers
   • /workflows:compound - references config for specialized agents

Test plan

• Run /compound-engineering-setup in a Rails project
• Verify Quick Setup creates appropriate defaults
• Verify Advanced Setup allows custom agent selection
• Run /workflows:review and confirm it reads from config
• Run /plan_review and confirm it reads from config

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