docs: Release v3.4.0 with TDD workflow optimization and test-gen enhancements

Version Update:
- Bump version from v3.3.0 to v3.4.0

Documentation Updates (README.md & README_CN.md):
- Updated version badges to v3.4.0
- Revised What's New section highlighting:
  * TDD workflow streamlining (33% file reduction)
  * Test coverage analysis (Phase 3 integration)
  * Iterative Green Phase with test-fix-cycle
  * Manual-first fixes with optional --use-codex
  * Test-gen workflow enhancements (3 new tool commands)
  * Dynamic timeout allocation (20-120min)

Command Reference Updates:
- Updated /workflow:tdd-plan description (6 phases)
- Enhanced /workflow:test-gen with [--use-codex] flag
- Added 3 new tool commands:
  * /workflow:tools:test-context-gather
  * /workflow:tools:test-concept-enhanced
  * /workflow:tools:test-task-generate

Version Files:
- Updated .claude/version.json to 3.4.0
- Updated .claude/commands/version.md examples

Key Features in v3.4.0:
- Eliminated TDD_PLAN.md and TDD_TASK_BREAKDOWN.md (unified IMPL_PLAN.md)
- TDD workflow upgraded from 5 to 6 phases
- Built-in test-fix-cycle in IMPL tasks
- Gemini diagnosis using bug-fix.md template
- Test-gen workflow with comprehensive test generation support

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

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

.claude/commands/version.md

@@ -170,8 +170,8 @@ Bash: bash <(curl -fsSL https://raw.githubusercontent.com/catlog22/Claude-Code-W
 
 **Scenario 3: Development version**
 ```
-✨ You are running a development version (3.3.0-dev)
-This is newer than the latest stable release (v3.2.2)
+✨ You are running a development version (3.4.0-dev)
+This is newer than the latest stable release (v3.3.0)
 ```
 
 ## Simple Bash Commands

.claude/version.json

@@ -1,5 +1,5 @@
 {
-  "version": "3.3.0",
+  "version": "3.4.0",
   "installation_mode": "Local",
   "installation_path": "D:\\Claude_dms3\\.claude",
   "source_branch": "main",