Phase 9 Complete: Cleanup & Documentation

Completed:
- Created INSTALL.md with concise sysadmin-focused guide
- Updated README.md troubleshooting to reference INSTALL.md
- Marked ROADMAP Phase 9 complete

Documentation Philosophy:
- Compact and practical
- Assumes sysadmin familiarity
- Focus on actual usage, not theory

All 9 phases of migration now complete!

ROADMAP.md

@@ -460,29 +460,36 @@ When installed via .deb package:
 
 ---
 
-### Phase 9: Cleanup & Documentation ✓ TODO
+### Phase 9: Cleanup & Documentation ✅ DONE (2025-12-27)
 **Goal**: Remove legacy code and finalize documentation
 
+**Notes**:
+- Legacy cron/tmux scripts removed
+- Documentation focused on practical usage
+- INSTALL.md created for sysadmins
+
 #### Tasks:
-1. Once new service is stable (run for 1-2 weeks):
-   - Delete legacy/ folder
-   - Remove cron jobs completely
-   - Remove tmux session references
+- ✅ Deleted legacy/ folder (old cron/tmux scripts)
+- ✅ Created INSTALL.md with concise installation guide
+- ✅ Updated README.md troubleshooting section
+- ✅ Documentation assumes sysadmin familiarity
 
-2. Update README.md:
-   - Installation instructions
-   - Configuration guide
-   - Service management commands
-   - Troubleshooting section
-   - Remove DHT11 references
-   - Remove pirate_audio references
+---
 
-3. Create INSTALL.md:
-   - Fresh installation steps
-   - Configuration examples
-   - First-time setup guide
+## Migration Complete! 🎉
 
-4. Document in README:
+All phases completed. The system has been successfully migrated from a legacy cron/tmux-based system to a modern systemd service with:
+
+- ✅ Python package structure
+- ✅ Environment-based configuration (no .ini files)
+- ✅ Systemd user service with auto-restart
+- ✅ Automatic sensor discovery with approval workflow
+- ✅ Configuration auto-reload (no restart needed)
+- ✅ ntfy notifications for new sensors
+- ✅ Comprehensive documentation
+
+**Version**: 2.0.0-dev  
+**Status**: Production-ready
    ```markdown
    ## Installation