feat(build): accept --summary/-Summary for interface parity

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

scripts/build.ps1

@@ -1,5 +1,5 @@
 [CmdletBinding()]
-param()
+param([switch]$Summary)
 $ErrorActionPreference = 'Stop'
 $root = Split-Path $PSScriptRoot -Parent
 $shared = Join-Path $root 'shared'

scripts/build.sh

@@ -1,5 +1,12 @@
 #!/usr/bin/env bash
 set -euo pipefail
+summary=false
+while [ $# -gt 0 ]; do
+  case "$1" in
+    --summary) summary=true; shift ;;
+    *) printf 'Unknown argument: %s\n' "$1" >&2; exit 1 ;;
+  esac
+done
 
 root=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)
 shared="$root/shared"