refactor: consolidate documentation directories

Merged claudedocs/ into docs/research/ for consistent documentation structure.

Changes:
- Moved all claudedocs/*.md files to docs/research/
- Updated all path references in documentation (EN/KR)
- Updated RULES.md and research.md command templates
- Removed claudedocs/ directory
- Removed ClaudeDocs/ from .gitignore

Benefits:
- Single source of truth for all research reports
- PEP8-compliant lowercase directory naming
- Clearer documentation organization
- Prevents future claudedocs/ directory creation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

docs/user-guide/commands.md

@@ -149,7 +149,7 @@ python3 -m SuperClaude install --list-components | grep mcp
 - **Planning Strategies**: Planning (direct), Intent (clarify first), Unified (collaborative)
 - **Parallel Execution**: Default parallel searches and extractions
 - **Evidence Management**: Clear citations with relevance scoring
-- **Output Standards**: Reports saved to `claudedocs/research_[topic]_[timestamp].md`
+- **Output Standards**: Reports saved to `docs/research/[topic]_[timestamp].md`
 
 ### `/sc:implement` - Feature Development  
 **Purpose**: Full-stack feature implementation with intelligent specialist routing