Honor quiet update mode in installers

install.ps1

@@ -17,6 +17,13 @@ param(
 )
 
 $ErrorActionPreference = "Stop"
+$Quiet = $env:DOSH_UPDATE_QUIET -and $env:DOSH_UPDATE_QUIET -ne "0"
+
+function Write-Info($Message) {
+    if (-not $Quiet) {
+        Write-Host $Message
+    }
+}
 
 function Require-Command($Name) {
     if (-not (Get-Command $Name -ErrorAction SilentlyContinue)) {
@@ -31,7 +38,7 @@ function Ensure-Cargo {
     if (-not (Get-Command winget -ErrorAction SilentlyContinue)) {
         throw "cargo not found and winget is unavailable; install Rust from https://rustup.rs or set DOSH_USE_PREBUILT=1"
     }
-    Write-Host "cargo not found; installing Rust toolchain with winget/rustup"
+    Write-Info "cargo not found; installing Rust toolchain with winget/rustup"
     winget install --id Rustlang.Rustup -e --accept-package-agreements --accept-source-agreements
     $cargoBin = Join-Path $HOME ".cargo\bin"
     if (Test-Path $cargoBin) {
@@ -358,7 +365,7 @@ function Install-Prebuilt {
     $extract = Join-Path $tmp "extract"
     try {
         New-Item -ItemType Directory -Force -Path $tmp, $extract | Out-Null
-        Write-Host "Trying Dosh prebuilt $(Release-ArtifactName)"
+        Write-Info "Trying Dosh prebuilt $(Release-ArtifactName)"
         Invoke-WebRequest -UseBasicParsing -Uri $url -OutFile $zip
         Verify-ArchiveChecksum $url $zip
         Expand-Archive -Force -Path $zip -DestinationPath $extract
@@ -427,7 +434,7 @@ if ($UsePrebuilt) {
         if ($BinaryRequired) {
             throw "prebuilt install failed and DOSH_BINARY_REQUIRED=1"
         }
-        Write-Host "Falling back to source build"
+        Write-Info "Falling back to source build"
         Install-FromSource
     }
 } else {
@@ -488,17 +495,17 @@ predict = true
 
 Add-UserPath $bindir
 
-Write-Host "Installed Dosh client to $bindir"
-Write-Host "Configured UDP port $Port"
-Write-Host ""
+Write-Info "Installed Dosh client to $bindir"
+Write-Info "Configured UDP port $Port"
+Write-Info ""
 $displayServer = if ($Server) { $Server } else { "user@host" }
-Write-Host "Client commands:"
-Write-Host "  $bindir\dosh.exe $displayServer"
-Write-Host "  $bindir\dosh.exe setup <ssh-alias>"
-Write-Host "  $bindir\dosh.exe update --check"
-Write-Host ""
-Write-Host "Client config:"
-Write-Host "  $configDir\client.toml"
-Write-Host "  $configDir\hosts.toml"
-Write-Host ""
-Write-Host "Open a new terminal for PATH changes to apply."
+Write-Info "Client commands:"
+Write-Info "  $bindir\dosh.exe $displayServer"
+Write-Info "  $bindir\dosh.exe setup <ssh-alias>"
+Write-Info "  $bindir\dosh.exe update --check"
+Write-Info ""
+Write-Info "Client config:"
+Write-Info "  $configDir\client.toml"
+Write-Info "  $configDir\hosts.toml"
+Write-Info ""
+Write-Info "Open a new terminal for PATH changes to apply."