docs: remove deprecated command migration documentation

- Remove 'Command Migration' section showing old commands
- Users must now use modern subcommand structure
- Clean up migration guide to focus on actual changes

readme.md

@@ -684,17 +684,6 @@ curl -sSL https://code.foss.global/serve.zone/nupst/raw/branch/main/install.sh |
 | **Commands** | Flat (`nupst add`) | Subcommands (`nupst ups add`) |
 | **Configuration** | UPS-level thresholds | Action-based thresholds |
 
-### Command Migration
-
-Old v3.x commands still work with deprecation warnings:
-
-| v3.x | v4.x | Still Works? |
-|------|------|--------------|
-| `nupst add` | `nupst ups add` | ✓ (with warning) |
-| `nupst list` | `nupst ups list` | ✓ (with warning) |
-| `nupst enable` | `nupst service enable` | ✓ (with warning) |
-| `nupst status` | `nupst service status` | ✓ (with warning) |
-
 ### Configuration Compatibility
 
 Your v3.x configuration is **fully compatible**. The migration system automatically converts: