chore(win): fixed artifact name + bump to 1.0.6

Use Water_Morph_Windows.exe (no version suffix) so the download URL
in route.ts never needs updating after version bumps.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: grauxmusic

CompanionWin/package.json

@@ -1,6 +1,6 @@
 {
   "name": "water-morph-helper",
-  "version": "1.0.5",
+  "version": "1.0.6",
   "description": "Water Morph companion — Windows",
   "main": "main.js",
   "scripts": {
@@ -35,7 +35,7 @@
           ]
         }
       ],
-      "artifactName": "Water_Morph_${version}_Windows.exe"
+      "artifactName": "Water_Morph_Windows.exe"
     },
     "mac": {
       "icon": "assets/icon.icns",