build(macos): add dmg+zip packaging

scripts/package-mac-dist.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Build the mac app bundle, then create a zip (Sparkle) + styled DMG (humans).
+#
+# Output:
+# - dist/Clawdis.app
+# - dist/Clawdis-<version>.zip
+# - dist/Clawdis-<version>.dmg
+
+ROOT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+
+"$ROOT_DIR/scripts/package-mac-app.sh"
+
+APP="$ROOT_DIR/dist/Clawdis.app"
+if [[ ! -d "$APP" ]]; then
+  echo "Error: missing app bundle at $APP" >&2
+  exit 1
+fi
+
+VERSION=$(/usr/libexec/PlistBuddy -c "Print CFBundleShortVersionString" "$APP/Contents/Info.plist" 2>/dev/null || echo "0.0.0")
+ZIP="$ROOT_DIR/dist/Clawdis-$VERSION.zip"
+DMG="$ROOT_DIR/dist/Clawdis-$VERSION.dmg"
+
+echo "📦 Zip: $ZIP"
+rm -f "$ZIP"
+ditto -c -k --sequesterRsrc --keepParent "$APP" "$ZIP"
+
+echo "💿 DMG: $DMG"
+"$ROOT_DIR/scripts/create-dmg.sh" "$APP" "$DMG"
+