Initial commit: HUDini — classic volume HUD for macOS

Menu bar utility that shows a centered HUD overlay with volume bars
when system volume changes. CoreAudio monitoring, auto-fade, works
on all spaces and fullscreen.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

build.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+set -e
+
+APP_NAME="HUDini"
+BUILD_DIR=".build"
+APP_BUNDLE="$APP_NAME.app"
+
+echo "Building $APP_NAME..."
+swift build -c release
+
+echo "Creating app bundle..."
+rm -rf "$APP_BUNDLE"
+mkdir -p "$APP_BUNDLE/Contents/MacOS"
+mkdir -p "$APP_BUNDLE/Contents/Resources"
+
+# Copy binary
+cp "$BUILD_DIR/release/$APP_NAME" "$APP_BUNDLE/Contents/MacOS/$APP_NAME"
+
+# Copy Info.plist
+cp "Sources/$APP_NAME/Resources/Info.plist" "$APP_BUNDLE/Contents/"
+
+echo "Done! Created $APP_BUNDLE"
+echo ""
+echo "To run:  open $APP_BUNDLE"
+echo "To install: cp -r $APP_BUNDLE /Applications/"