feat: project refactoring - folder cleanup, governance, and automation

Project Structure Cleanup:
- Remove deprecated cmdb-assistant plugin
- Remove development output files (test scripts, status reports)
- Remove IDE-specific workspace files
- Create scripts/ directory for automation
- Create docs/architecture/ for Draw.io diagrams
- Create docs/workflows/ for workflow documentation
- Create .scratch/ directory for transient work

Governance & Documentation:
- Add File Creation Governance section to CLAUDE.md
- Add architecture diagram specifications (component-map, agent-workflow)
- Add docs/UPDATING.md with update workflow
- Update CHANGELOG.md with all changes

Installation Automation:
- Add scripts/setup.sh for initial installation
- Add scripts/post-update.sh for updates after git pull
- Add /initial-setup slash command

Maintenance:
- Update .gitignore with scratch directory
- Fix all project name references (use support-claude-mktplace)

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -1,3 +1,7 @@
+# Scratch directory contents (keep .gitkeep)
+.scratch/*
+!.scratch/.gitkeep
+
 # Python
 *.py[cod]
 *$py.class