Add lightweight codebase scanning before gray area identification:
- New scout_codebase step checks for existing maps or does targeted grep
- Gray areas annotated with code context (existing components, patterns)
- Discussion options informed by what already exists in the codebase
- Context7 integration for library-specific questions
- CONTEXT.md template includes code_context section
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>