switch release workflow to binary only

scripts/install/install.ps1

@@ -109,8 +109,8 @@ This usually means the release exists, but not all platform bundles were uploade
 
 Workarounds:
   - try again after the release finishes publishing
-  - install via pnpm instead: pnpm add -g @companion-ai/feynman
-  - install via bun instead: bun add -g @companion-ai/feynman
+  - pass the latest published version explicitly, e.g.:
+    & ([scriptblock]::Create((irm https://feynman.is/install.ps1))) -Version 0.2.16
 "@
   }
 
@@ -159,9 +159,7 @@ CALL "$bundleDir\feynman.cmd" %*
     Write-Warning "Current shell resolves feynman to $($resolvedCommand.Source)"
     Write-Host "Run in a new shell, or run: `$env:Path = '$installBinDir;' + `$env:Path"
     Write-Host "Then run: feynman"
-    if ($resolvedCommand.Source -like "*node_modules*@companion-ai*feynman*") {
-      Write-Host "If that path is an old global npm install, remove it with: npm uninstall -g @companion-ai/feynman"
-    }
+    Write-Host "If that path is an old package-manager install, remove it or put $installBinDir first on PATH."
   }
 
   Write-Host "Feynman $resolvedVersion installed successfully."