Roadmap Integration

@marcusgoll/spec-flow-roadmap-integration

Standard Operating Procedure for /roadmap usage. Manage product roadmap via GitHub Issues (brainstorm, prioritize, track). Auto-validates features against project vision (from overview.md) before adding to roadmap. Triggers when user runs /roadmap or mentions 'roadmap', 'add feature', 'brainstorm ideas', or 'prioritize features'.