auto-detect and stage corp TLS-inspection root CA before docker build

GE/Zscaler proxy inspection breaks npm ci silently, leaving node_modules
incomplete and vite missing at build time. Detect the root CA from the
host's chain to the npm registry and stage it as corp-root-ca.pem so the
Dockerfile trusts it; harmless on clean networks.

scripts/dev-bootstrap.ps1

@@ -98,6 +98,51 @@ function Test-Command {
 	return [bool](Get-Command $Name -ErrorAction SilentlyContinue)
 }
 
+# Detect a corporate TLS-inspection root CA (e.g. Zscaler) by inspecting the
+# certificate chain the host uses to reach the npm registry, then stage it as
+# corp-root-ca.pem in the build context so the Docker frontend build can trust
+# it. On a clean network this simply stages a public root, which is harmless.
+# Writes nothing and returns quietly when detection is not possible.
+function Set-CorpRootCa {
+	param(
+		[Parameter(Mandatory)][string]$RepoRoot
+	)
+
+	$certPath = Join-Path $RepoRoot 'corp-root-ca.pem'
+
+	try {
+		$request = [System.Net.HttpWebRequest]::Create('https://registry.npmjs.org/')
+		$request.Method = 'HEAD'
+		$request.Timeout = 10000
+		try { $response = $request.GetResponse(); $response.Close() } catch { }
+
+		$cert = $request.ServicePoint.Certificate
+		if (-not $cert) {
+			Write-Warn 'Could not read the TLS certificate chain; skipping corp CA staging.'
+			return
+		}
+
+		$chain = New-Object System.Security.Cryptography.X509Certificates.X509Chain
+		$chain.ChainPolicy.RevocationMode = 'NoCheck'
+		$cert2 = New-Object System.Security.Cryptography.X509Certificates.X509Certificate2($cert)
+		[void]$chain.Build($cert2)
+
+		$root = $chain.ChainElements[$chain.ChainElements.Count - 1].Certificate
+		$issuer = $root.Subject
+
+		$builder = New-Object System.Text.StringBuilder
+		[void]$builder.AppendLine('-----BEGIN CERTIFICATE-----')
+		[void]$builder.AppendLine([System.Convert]::ToBase64String($root.RawData, 'InsertLineBreaks'))
+		[void]$builder.AppendLine('-----END CERTIFICATE-----')
+		Set-Content -Path $certPath -Value $builder.ToString() -Encoding ASCII
+
+		Write-Ok "Staged corp-root-ca.pem from root CA: $issuer"
+	}
+	catch {
+		Write-Warn "Corp CA detection failed ($($_.Exception.Message)); continuing without it."
+	}
+}
+
 # Confirm a dependency, offering a winget install when it is missing. Returns
 # $true when the dependency is present (or was just installed), $false when the
 # dev declined or install failed.
@@ -246,6 +291,9 @@ try {
 
 	# --- 4. Build and start ---------------------------------------------------
 
+	Write-Step 'Detecting corporate TLS-inspection CA for the Docker build'
+	Set-CorpRootCa -RepoRoot $repoRoot
+
 	Write-Step "Building and starting the '$($config.Project)' stack"
 	$composeArgs = @(
 		'compose',