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/modes.md

@@ -154,19 +154,19 @@ Deep Research Mode:
  ✓ TodoWrite: Created 8 research tasks
  🔄 Executing parallel searches across domains
  📈 Confidence: 0.82 across 15 verified sources
- 📝 Report saved: claudedocs/research_quantum_[timestamp].md"
+ 📝 Report saved: docs/research/research_quantum_[timestamp].md"
 ```
 
 #### Quality Standards
 - [ ] Minimum 2 sources per claim with inline citations
 - [ ] Confidence scoring (0.0-1.0) for all findings
 - [ ] Parallel execution by default for independent operations
-- [ ] Reports saved to claudedocs/ with proper structure
+- [ ] Reports saved to docs/research/ with proper structure
 - [ ] Clear methodology and evidence presentation
 
-**Verify:** `/sc:research "test topic"` should create TodoWrite and execute systematically  
-**Test:** All research should include confidence scores and citations  
-**Check:** Reports should be saved to claudedocs/ automatically
+**Verify:** `/sc:research "test topic"` should create TodoWrite and execute systematically
+**Test:** All research should include confidence scores and citations
+**Check:** Reports should be saved to docs/research/ automatically
 
 **Works Best With:**
 - **→ Task Management**: Research planning with TodoWrite integration