chore: bump version to 4.1.8

Updated version across all documentation files:
- pyproject.toml (main version)
- README files (en, ja, kr, zh)
- CLAUDE.md
- KNOWLEDGE.md
- PLANNING.md

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

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

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "superclaude"
-version = "4.1.7"
+version = "4.1.8"
 description = "AI-enhanced development framework for Claude Code - pytest plugin with optional skills"
 readme = "README.md"
 license = {text = "MIT"}