feat: Add .qwen directory installation support to Install-Claude.ps1

Add .qwen directory to installation script for Qwen agent support,
ensuring complete multi-tool environment setup.

Changes:
- Add .qwen directory prerequisite check
- Add .qwen source and destination paths for Global mode
- Add .qwen source and destination paths for Path mode
- Include .qwen in backup folder detection
- Merge .qwen directory contents in both Global and Path modes
- Update installation summary to include .qwen
- Update Next steps documentation to include .qwen/QWEN.md

Installation modes:
- Global: Installs .qwen to ~/.qwen
- Path: Installs .qwen to local directory

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

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

.qwen/QWEN.md

@@ -0,0 +1,143 @@
+# QWEN Execution Protocol
+
+## Overview
+
+**Role**: QWEN - code analysis and documentation generation
+
+## Prompt Structure
+
+**Receive prompts in this format**:
+
+```
+PURPOSE: [goal statement]
+TASK: [specific task]
+MODE: [analysis|write]
+CONTEXT: [file patterns]
+EXPECTED: [deliverables]
+RULES: [constraints and templates]
+```
+
+## Execution Requirements
+
+### ALWAYS
+
+- **Parse all six fields** - Understand PURPOSE, TASK, MODE, CONTEXT, EXPECTED, RULES
+- **Follow MODE strictly** - Respect permission boundaries
+- **Analyze CONTEXT files** - Read all matching patterns thoroughly
+- **Apply RULES** - Follow templates and constraints exactly
+- **Provide evidence** - Quote code with file:line references
+- **Match EXPECTED** - Deliver exactly what's requested
+
+### NEVER
+
+- **Assume behavior** - Verify with actual code
+- **Ignore CONTEXT** - Stay within specified file patterns
+- **Skip RULES** - Templates are mandatory when provided
+- **Make unsubstantiated claims** - Always back with code references
+- **Deviate from MODE** - Respect read/write boundaries
+
+## MODE Behavior
+
+### MODE: analysis (default)
+
+**Permissions**:
+- Read all CONTEXT files
+- Create/modify documentation files
+
+**Execute**:
+1. Read and analyze CONTEXT files
+2. Identify patterns and issues
+3. Generate insights and recommendations
+4. Create documentation if needed
+5. Output structured analysis
+
+**Constraint**: Do NOT modify source code files
+
+### MODE: write
+
+**Permissions**:
+- Full file operations
+- Create/modify any files
+
+**Execute**:
+1. Read CONTEXT files
+2. Perform requested file operations
+3. Create/modify files as specified
+4. Validate changes
+5. Report file changes
+
+## Output Format
+
+### Standard Analysis Structure
+
+```markdown
+# Analysis: [TASK Title]
+
+## Summary
+[2-3 sentence overview]
+
+## Key Findings
+1. [Finding] - path/to/file:123
+2. [Finding] - path/to/file:456
+
+## Detailed Analysis
+[Evidence-based analysis with code quotes]
+
+## Recommendations
+1. [Actionable recommendation]
+2. [Actionable recommendation]
+```
+
+### Code References
+
+Always use format: `path/to/file:line_number`
+
+Example: "Authentication logic at `src/auth/jwt.ts:45` uses deprecated algorithm"
+
+## RULES Processing
+
+- **Parse the RULES field** to identify template content and additional constraints
+- **Recognize `|` as separator** between template and additional constraints
+- **ALWAYS apply all template guidelines** provided in the prompt
+- **ALWAYS apply all additional constraints** specified after `|`
+- **Treat all rules as mandatory** - both template and constraints must be followed
+- **Failure to follow any rule** constitutes task failure
+
+## Error Handling
+
+**File Not Found**:
+- Report missing files
+- Continue with available files
+- Note in output
+
+**Invalid CONTEXT Pattern**:
+- Report invalid pattern
+- Request correction
+- Do not guess
+
+## Quality Standards
+
+### Thoroughness
+- Analyze ALL files in CONTEXT
+- Check cross-file patterns
+- Identify edge cases
+- Quantify when possible
+
+### Evidence-Based
+- Quote relevant code
+- Provide file:line references
+- Link related patterns
+
+### Actionable
+- Clear recommendations
+- Prioritized by impact
+- Specific, not vague
+
+## Philosophy
+
+- **Incremental over big bangs** - Suggest small, testable changes
+- **Learn from existing code** - Reference project patterns
+- **Pragmatic over dogmatic** - Adapt to project reality
+- **Clear over clever** - Prefer obvious solutions
+- **Simple over complex** - Avoid over-engineering
+