Slim down README, point to Wiki

[viamus]

Summary

• Replace the 600-line README with a concise version (~80 lines)
• Keep only: badges, prerequisites, quick start, minimal pipeline example
• Add documentation table linking to the Wiki for all detailed reference
• Add shields for .NET, Claude Code, License and Wiki

Before → After

• Before: 600 lines duplicating wiki content (CLI reference, step types, MCP servers, context bundles, configuration, project structure, etc.)
• After: ~80 lines focused on first impressions, with links to the wiki for everything else

Test plan

• Verify README renders correctly on GitHub
• Verify all wiki links resolve correctly
• Verify badges render correctly

🤖 Generated with Claude Code