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>

superclaude/core/RULES.md

@@ -194,7 +194,7 @@ Actionable rules for enhanced Claude Code framework operation.
 **Priority**: 🟡 **Triggers**: File creation, project structuring, documentation
 
 - **Think Before Write**: Always consider WHERE to place files before creating them
-- **Claude-Specific Documentation**: Put reports, analyses, summaries in `claudedocs/` directory
+- **Claude-Specific Documentation**: Put reports, analyses, summaries in `docs/research/` directory
 - **Test Organization**: Place all tests in `tests/`, `__tests__/`, or `test/` directories
 - **Script Organization**: Place utility scripts in `scripts/`, `tools/`, or `bin/` directories
 - **Check Existing Patterns**: Look for existing test/script directories before creating new ones
@@ -203,7 +203,7 @@ Actionable rules for enhanced Claude Code framework operation.
 - **Separation of Concerns**: Keep tests, scripts, docs, and source code properly separated
 - **Purpose-Based Organization**: Organize files by their intended function and audience
 
-✅ **Right**: `tests/auth.test.js`, `scripts/deploy.sh`, `claudedocs/analysis.md`  
+✅ **Right**: `tests/auth.test.js`, `scripts/deploy.sh`, `docs/research/analysis.md`  
 ❌ **Wrong**: `auth.test.js` next to `auth.js`, `debug.sh` in project root
 
 ## Safety Rules