diff --git a/macos-spm-app-packaging/SKILL.md b/macos-spm-app-packaging/SKILL.md
new file mode 100644
index 0000000..be3c0f1
--- /dev/null
+++ b/macos-spm-app-packaging/SKILL.md
@@ -0,0 +1,38 @@
+---
+name: macos-spm-app-packaging
+description: Scaffold, build, and package SwiftPM-based macOS apps without an Xcode project. Use when you need a from-scratch macOS app layout, SwiftPM targets/resources, a custom .app bundle assembly script, or signing/notarization/appcast steps outside Xcode.
+---
+
+# macOS SwiftPM App Packaging (No Xcode)
+
+## Overview
+Bootstrap a complete SwiftPM macOS app folder, then build, package, and run it without Xcode. Use `assets/templates/bootstrap/` for the starter layout and `references/packaging.md` + `references/release.md` for packaging and release details.
+
+## Two-Step Workflow
+1) Bootstrap the project folder
+   - Copy `assets/templates/bootstrap/` into a new repo.
+   - Rename `MyApp` in `Package.swift`, `Sources/MyApp/`, and `version.env`.
+   - Customize `APP_NAME`, `BUNDLE_ID`, and versions.
+
+2) Build, package, and run the bootstrapped app
+   - Copy scripts from `assets/templates/` into your repo (for example, `Scripts/`).
+   - Build/tests: `swift build` and `swift test`.
+   - Package: `Scripts/package_app.sh`.
+   - Run: `Scripts/compile_and_run.sh` (preferred) or `Scripts/launch.sh`.
+   - Release (optional): `Scripts/sign-and-notarize.sh` and `Scripts/make_appcast.sh`.
+
+## Templates
+- `assets/templates/package_app.sh`: Build binaries, create the .app bundle, copy resources, sign.
+- `assets/templates/compile_and_run.sh`: Dev loop to kill running app, package, launch.
+- `assets/templates/build_icon.sh`: Generate .icns from an Icon Composer file (requires Xcode install).
+- `assets/templates/sign-and-notarize.sh`: Notarize, staple, and zip a release build.
+- `assets/templates/make_appcast.sh`: Generate Sparkle appcast entries for updates.
+- `assets/templates/setup_dev_signing.sh`: Create a stable dev code-signing identity.
+- `assets/templates/launch.sh`: Simple launcher for a packaged .app.
+- `assets/templates/version.env`: Example version file consumed by packaging scripts.
+- `assets/templates/bootstrap/`: Minimal SwiftPM macOS app skeleton (Package.swift, Sources/, version.env).
+
+## Notes
+- Keep entitlements and signing configuration explicit; edit the template scripts instead of reimplementing.
+- Remove Sparkle steps if you do not use Sparkle for updates.
+- For menu bar apps, set `MENU_BAR_APP=1` when packaging to emit `LSUIElement` in Info.plist.
diff --git a/macos-spm-app-packaging/assets/templates/bootstrap/Package.swift b/macos-spm-app-packaging/assets/templates/bootstrap/Package.swift
new file mode 100644
index 0000000..3207b8e
--- /dev/null
+++ b/macos-spm-app-packaging/assets/templates/bootstrap/Package.swift
@@ -0,0 +1,17 @@
+// swift-tools-version: 6.2
+import PackageDescription
+
+let package = Package(
+    name: "MyApp",
+    platforms: [
+        .macOS(.v14),
+    ],
+    targets: [
+        .executableTarget(
+            name: "MyApp",
+            path: "Sources/MyApp",
+            resources: [
+                .process("Resources"),
+            ])
+    ]
+)
diff --git a/macos-spm-app-packaging/assets/templates/bootstrap/Sources/MyApp/Resources/.keep b/macos-spm-app-packaging/assets/templates/bootstrap/Sources/MyApp/Resources/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/macos-spm-app-packaging/assets/templates/bootstrap/Sources/MyApp/main.swift b/macos-spm-app-packaging/assets/templates/bootstrap/Sources/MyApp/main.swift
new file mode 100644
index 0000000..e317016
--- /dev/null
+++ b/macos-spm-app-packaging/assets/templates/bootstrap/Sources/MyApp/main.swift
@@ -0,0 +1,11 @@
+import SwiftUI
+
+@main
+struct MyApp: App {
+    var body: some Scene {
+        WindowGroup {
+            Text("Hello from MyApp")
+                .padding()
+        }
+    }
+}
diff --git a/macos-spm-app-packaging/assets/templates/bootstrap/version.env b/macos-spm-app-packaging/assets/templates/bootstrap/version.env
new file mode 100644
index 0000000..6c5435e
--- /dev/null
+++ b/macos-spm-app-packaging/assets/templates/bootstrap/version.env
@@ -0,0 +1,2 @@
+MARKETING_VERSION=0.1.0
+BUILD_NUMBER=1
diff --git a/macos-spm-app-packaging/assets/templates/build_icon.sh b/macos-spm-app-packaging/assets/templates/build_icon.sh
new file mode 100644
index 0000000..464c485
--- /dev/null
+++ b/macos-spm-app-packaging/assets/templates/build_icon.sh
@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ICON_FILE=${1:-Icon.icon}
+BASENAME=${2:-Icon}
+OUT_ROOT=${3:-build/icon}
+XCODE_APP=${XCODE_APP:-/Applications/Xcode.app}
+
+ICTOOL="$XCODE_APP/Contents/Applications/Icon Composer.app/Contents/Executables/ictool"
+if [[ ! -x "$ICTOOL" ]]; then
+  ICTOOL="$XCODE_APP/Contents/Applications/Icon Composer.app/Contents/Executables/icontool"
+fi
+if [[ ! -x "$ICTOOL" ]]; then
+  echo "ictool/icontool not found. Set XCODE_APP if Xcode is elsewhere." >&2
+  exit 1
+fi
+
+ICONSET_DIR="$OUT_ROOT/${BASENAME}.iconset"
+TMP_DIR="$OUT_ROOT/tmp"
+mkdir -p "$ICONSET_DIR" "$TMP_DIR"
+
+MASTER_ART="$TMP_DIR/icon_art_824.png"
+MASTER_1024="$TMP_DIR/icon_1024.png"
+
+# Render inner art (no margin) with macOS Default appearance.
+"$ICTOOL" "$ICON_FILE" \
+  --export-preview macOS Default 824 824 1 -45 "$MASTER_ART"
+
+# Pad to 1024x1024 with transparent border.
+sips --padToHeightWidth 1024 1024 "$MASTER_ART" --out "$MASTER_1024" >/dev/null
+
+# Generate required sizes.
+sizes=(16 32 64 128 256 512 1024)
+for sz in "${sizes[@]}"; do
+  out="$ICONSET_DIR/icon_${sz}x${sz}.png"
+  sips -z "$sz" "$sz" "$MASTER_1024" --out "$out" >/dev/null
+  if [[ "$sz" -ne 1024 ]]; then
+    dbl=$((sz*2))
+    out2="$ICONSET_DIR/icon_${sz}x${sz}@2x.png"
+    sips -z "$dbl" "$dbl" "$MASTER_1024" --out "$out2" >/dev/null
+  fi
+done
+
+# 512x512@2x already covered by 1024; ensure it exists.
+cp "$MASTER_1024" "$ICONSET_DIR/icon_512x512@2x.png"
+
+iconutil -c icns "$ICONSET_DIR" -o Icon.icns
+
+echo "Icon.icns generated at $(pwd)/Icon.icns"
diff --git a/macos-spm-app-packaging/assets/templates/compile_and_run.sh b/macos-spm-app-packaging/assets/templates/compile_and_run.sh
new file mode 100644
index 0000000..8bec4bc
--- /dev/null
+++ b/macos-spm-app-packaging/assets/templates/compile_and_run.sh
@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+# Kill running instances, package, relaunch, verify.
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+APP_NAME=${APP_NAME:-MyApp}
+APP_BUNDLE="${ROOT_DIR}/${APP_NAME}.app"
+APP_PROCESS_PATTERN="${APP_NAME}.app/Contents/MacOS/${APP_NAME}"
+DEBUG_PROCESS_PATTERN="${ROOT_DIR}/.build/debug/${APP_NAME}"
+RELEASE_PROCESS_PATTERN="${ROOT_DIR}/.build/release/${APP_NAME}"
+RUN_TESTS=0
+RELEASE_ARCHES=""
+
+log() { printf '%s\n' "$*"; }
+fail() { printf 'ERROR: %s\n' "$*" >&2; exit 1; }
+
+for arg in "$@"; do
+  case "${arg}" in
+    --test|-t) RUN_TESTS=1 ;;
+    --release-universal) RELEASE_ARCHES="arm64 x86_64" ;;
+    --release-arches=*) RELEASE_ARCHES="${arg#*=}" ;;
+    --help|-h)
+      log "Usage: $(basename "$0") [--test] [--release-universal] [--release-arches=\"arm64 x86_64\"]"
+      exit 0
+      ;;
+  esac
+done
+
+log "==> Killing existing ${APP_NAME} instances"
+pkill -f "${APP_PROCESS_PATTERN}" 2>/dev/null || true
+pkill -f "${DEBUG_PROCESS_PATTERN}" 2>/dev/null || true
+pkill -f "${RELEASE_PROCESS_PATTERN}" 2>/dev/null || true
+pkill -x "${APP_NAME}" 2>/dev/null || true
+
+if [[ "${RUN_TESTS}" == "1" ]]; then
+  log "==> swift test"
+  swift test -q
+fi
+
+HOST_ARCH="$(uname -m)"
+ARCHES_VALUE="${HOST_ARCH}"
+if [[ -n "${RELEASE_ARCHES}" ]]; then
+  ARCHES_VALUE="${RELEASE_ARCHES}"
+fi
+
+log "==> package app"
+SIGNING_MODE=adhoc ARCHES="${ARCHES_VALUE}" "${ROOT_DIR}/Scripts/package_app.sh" release
+
+log "==> launch app"
+if ! open "${APP_BUNDLE}"; then
+  log "WARN: open failed; launching binary directly."
+  "${APP_BUNDLE}/Contents/MacOS/${APP_NAME}" >/dev/null 2>&1 &
+  disown
+fi
+
+for _ in {1..10}; do
+  if pgrep -f "${APP_PROCESS_PATTERN}" >/dev/null 2>&1; then
+    log "OK: ${APP_NAME} is running."
+    exit 0
+  fi
+  sleep 0.4
+done
+fail "App exited immediately. Check crash logs in Console.app (User Reports)."
diff --git a/macos-spm-app-packaging/assets/templates/launch.sh b/macos-spm-app-packaging/assets/templates/launch.sh
new file mode 100644
index 0000000..92af4e1
--- /dev/null
+++ b/macos-spm-app-packaging/assets/templates/launch.sh
@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+APP_NAME=${APP_NAME:-MyApp}
+APP_PATH="$PROJECT_ROOT/${APP_NAME}.app"
+
+echo "==> Killing existing ${APP_NAME} instances"
+pkill -x "$APP_NAME" || pkill -f "${APP_NAME}.app" || true
+sleep 0.5
+
+if [[ ! -d "$APP_PATH" ]]; then
+    echo "ERROR: ${APP_NAME}.app not found at $APP_PATH"
+    echo "Run ./Scripts/package_app.sh first to build the app"
+    exit 1
+fi
+
+echo "==> Launching ${APP_NAME} from $APP_PATH"
+open -n "$APP_PATH"
+
+sleep 1
+if pgrep -x "$APP_NAME" > /dev/null; then
+    echo "OK: ${APP_NAME} is running."
+else
+    echo "ERROR: App exited immediately. Check crash logs in Console.app (User Reports)."
+    exit 1
+fi
diff --git a/macos-spm-app-packaging/assets/templates/make_appcast.sh b/macos-spm-app-packaging/assets/templates/make_appcast.sh
new file mode 100644
index 0000000..1dce6d9
--- /dev/null
+++ b/macos-spm-app-packaging/assets/templates/make_appcast.sh
@@ -0,0 +1,82 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT=$(cd "$(dirname "$0")/.." && pwd)
+ZIP=${1:?
+"Usage: $0 MyApp-<ver>.zip"}
+FEED_URL=${2:-"https://example.com/appcast.xml"}
+PRIVATE_KEY_FILE=${SPARKLE_PRIVATE_KEY_FILE:-}
+if [[ -z "$PRIVATE_KEY_FILE" ]]; then
+  echo "Set SPARKLE_PRIVATE_KEY_FILE to your ed25519 private key (Sparkle)." >&2
+  exit 1
+fi
+if [[ ! -f "$ZIP" ]]; then
+  echo "Zip not found: $ZIP" >&2
+  exit 1
+fi
+
+ZIP_DIR=$(cd "$(dirname "$ZIP")" && pwd)
+ZIP_NAME=$(basename "$ZIP")
+ZIP_BASE="${ZIP_NAME%.zip}"
+VERSION=${SPARKLE_RELEASE_VERSION:-}
+if [[ -z "$VERSION" ]]; then
+  if [[ "$ZIP_NAME" =~ ^[^-]+-([0-9]+(\.[0-9]+){1,2}([-.][^.]*)?)\.zip$ ]]; then
+    VERSION="${BASH_REMATCH[1]}"
+  else
+    echo "Could not infer version from $ZIP_NAME; set SPARKLE_RELEASE_VERSION." >&2
+    exit 1
+  fi
+fi
+
+NOTES_HTML="${ZIP_DIR}/${ZIP_BASE}.html"
+KEEP_NOTES=${KEEP_SPARKLE_NOTES:-0}
+if [[ -x "$ROOT/Scripts/changelog-to-html.sh" ]]; then
+  "$ROOT/Scripts/changelog-to-html.sh" "$VERSION" >"$NOTES_HTML"
+else
+  cat >"$NOTES_HTML" <<HTML
+<!doctype html>
+<html lang="en">
+<meta charset="utf-8">
+<title>${ZIP_BASE}</title>
+<body>
+<h2>${ZIP_BASE}</h2>
+<p>Release notes not provided.</p>
+</body>
+</html>
+HTML
+fi
+cleanup() {
+  if [[ -n "${WORK_DIR:-}" ]]; then
+    rm -rf "$WORK_DIR"
+  fi
+  if [[ "$KEEP_NOTES" != "1" ]]; then
+    rm -f "$NOTES_HTML"
+  fi
+}
+trap cleanup EXIT
+
+DOWNLOAD_URL_PREFIX=${SPARKLE_DOWNLOAD_URL_PREFIX:-"https://example.com/downloads/v${VERSION}/"}
+
+if ! command -v generate_appcast >/dev/null; then
+  echo "generate_appcast not found in PATH. Install Sparkle tools." >&2
+  exit 1
+fi
+
+WORK_DIR=$(mktemp -d /tmp/appcast.XXXXXX)
+
+cp "$ROOT/appcast.xml" "$WORK_DIR/appcast.xml"
+cp "$ZIP" "$WORK_DIR/$ZIP_NAME"
+cp "$NOTES_HTML" "$WORK_DIR/$ZIP_BASE.html"
+
+pushd "$WORK_DIR" >/dev/null
+generate_appcast \
+  --ed-key-file "$PRIVATE_KEY_FILE" \
+  --download-url-prefix "$DOWNLOAD_URL_PREFIX" \
+  --embed-release-notes \
+  --link "$FEED_URL" \
+  "$WORK_DIR"
+popd >/dev/null
+
+cp "$WORK_DIR/appcast.xml" "$ROOT/appcast.xml"
+
+echo "Appcast generated (appcast.xml). Upload alongside $ZIP at $FEED_URL"
diff --git a/macos-spm-app-packaging/assets/templates/package_app.sh b/macos-spm-app-packaging/assets/templates/package_app.sh
new file mode 100644
index 0000000..1175cbc
--- /dev/null
+++ b/macos-spm-app-packaging/assets/templates/package_app.sh
@@ -0,0 +1,206 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+CONF=${1:-release}
+ROOT=$(cd "$(dirname "$0")/.." && pwd)
+cd "$ROOT"
+
+APP_NAME=${APP_NAME:-MyApp}
+BUNDLE_ID=${BUNDLE_ID:-com.example.myapp}
+MACOS_MIN_VERSION=${MACOS_MIN_VERSION:-14.0}
+MENU_BAR_APP=${MENU_BAR_APP:-0}
+SIGNING_MODE=${SIGNING_MODE:-}
+APP_IDENTITY=${APP_IDENTITY:-}
+
+if [[ -f "$ROOT/version.env" ]]; then
+  source "$ROOT/version.env"
+else
+  MARKETING_VERSION=${MARKETING_VERSION:-0.1.0}
+  BUILD_NUMBER=${BUILD_NUMBER:-1}
+fi
+
+ARCH_LIST=( ${ARCHES:-} )
+if [[ ${#ARCH_LIST[@]} -eq 0 ]]; then
+  HOST_ARCH=$(uname -m)
+  ARCH_LIST=("$HOST_ARCH")
+fi
+
+for ARCH in "${ARCH_LIST[@]}"; do
+  swift build -c "$CONF" --arch "$ARCH"
+done
+
+APP="$ROOT/${APP_NAME}.app"
+rm -rf "$APP"
+mkdir -p "$APP/Contents/MacOS" "$APP/Contents/Resources" "$APP/Contents/Frameworks"
+
+# Convert Icon.icon to Icon.icns if present (requires iconutil).
+ICON_SOURCE="$ROOT/Icon.icon"
+ICON_TARGET="$ROOT/Icon.icns"
+if [[ -f "$ICON_SOURCE" ]]; then
+  iconutil --convert icns --output "$ICON_TARGET" "$ICON_SOURCE"
+fi
+
+LSUI_VALUE="false"
+if [[ "$MENU_BAR_APP" == "1" ]]; then
+  LSUI_VALUE="true"
+fi
+
+BUILD_TIMESTAMP=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
+GIT_COMMIT=$(git rev-parse --short HEAD 2>/dev/null || echo "unknown")
+
+cat > "$APP/Contents/Info.plist" <<PLIST
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>CFBundleName</key><string>${APP_NAME}</string>
+    <key>CFBundleDisplayName</key><string>${APP_NAME}</string>
+    <key>CFBundleIdentifier</key><string>${BUNDLE_ID}</string>
+    <key>CFBundleExecutable</key><string>${APP_NAME}</string>
+    <key>CFBundlePackageType</key><string>APPL</string>
+    <key>CFBundleShortVersionString</key><string>${MARKETING_VERSION}</string>
+    <key>CFBundleVersion</key><string>${BUILD_NUMBER}</string>
+    <key>LSMinimumSystemVersion</key><string>${MACOS_MIN_VERSION}</string>
+    <key>LSUIElement</key><${LSUI_VALUE}/>
+    <key>CFBundleIconFile</key><string>Icon</string>
+    <key>BuildTimestamp</key><string>${BUILD_TIMESTAMP}</string>
+    <key>GitCommit</key><string>${GIT_COMMIT}</string>
+</dict>
+</plist>
+PLIST
+
+build_product_path() {
+  local name="$1"
+  local arch="$2"
+  case "$arch" in
+    arm64|x86_64) echo ".build/${arch}-apple-macosx/$CONF/$name" ;;
+    *) echo ".build/$CONF/$name" ;;
+  esac
+}
+
+verify_binary_arches() {
+  local binary="$1"; shift
+  local expected=("$@")
+  local actual
+  actual=$(lipo -archs "$binary")
+  local actual_count expected_count
+  actual_count=$(wc -w <<<"$actual" | tr -d ' ')
+  expected_count=${#expected[@]}
+  if [[ "$actual_count" -ne "$expected_count" ]]; then
+    echo "ERROR: $binary arch mismatch (expected: ${expected[*]}, actual: ${actual})" >&2
+    exit 1
+  fi
+  for arch in "${expected[@]}"; do
+    if [[ "$actual" != *"$arch"* ]]; then
+      echo "ERROR: $binary missing arch $arch (have: ${actual})" >&2
+      exit 1
+    fi
+  done
+}
+
+install_binary() {
+  local name="$1"
+  local dest="$2"
+  local binaries=()
+  for arch in "${ARCH_LIST[@]}"; do
+    local src
+    src=$(build_product_path "$name" "$arch")
+    if [[ ! -f "$src" ]]; then
+      echo "ERROR: Missing ${name} build for ${arch} at ${src}" >&2
+      exit 1
+    fi
+    binaries+=("$src")
+  done
+  if [[ ${#ARCH_LIST[@]} -gt 1 ]]; then
+    lipo -create "${binaries[@]}" -output "$dest"
+  else
+    cp "${binaries[0]}" "$dest"
+  fi
+  chmod +x "$dest"
+  verify_binary_arches "$dest" "${ARCH_LIST[@]}"
+}
+
+install_binary "$APP_NAME" "$APP/Contents/MacOS/$APP_NAME"
+
+# Bundle app resources (if any).
+APP_RESOURCES_DIR="$ROOT/Sources/$APP_NAME/Resources"
+if [[ -d "$APP_RESOURCES_DIR" ]]; then
+  cp -R "$APP_RESOURCES_DIR/." "$APP/Contents/Resources/"
+fi
+
+# SwiftPM resource bundles are emitted next to the built binary.
+PREFERRED_BUILD_DIR="$(dirname "$(build_product_path "$APP_NAME" "${ARCH_LIST[0]}")")"
+shopt -s nullglob
+SWIFTPM_BUNDLES=("${PREFERRED_BUILD_DIR}/"*.bundle)
+shopt -u nullglob
+if [[ ${#SWIFTPM_BUNDLES[@]} -gt 0 ]]; then
+  for bundle in "${SWIFTPM_BUNDLES[@]}"; do
+    cp -R "$bundle" "$APP/Contents/Resources/"
+  done
+fi
+
+# Embed frameworks if any exist in the build folder.
+FRAMEWORK_DIRS=(".build/$CONF" ".build/${ARCH_LIST[0]}-apple-macosx/$CONF")
+for dir in "${FRAMEWORK_DIRS[@]}"; do
+  if compgen -G "${dir}/*.framework" >/dev/null; then
+    cp -R "${dir}/"*.framework "$APP/Contents/Frameworks/"
+    chmod -R a+rX "$APP/Contents/Frameworks"
+    install_name_tool -add_rpath "@executable_path/../Frameworks" "$APP/Contents/MacOS/$APP_NAME"
+    break
+  fi
+done
+
+if [[ -f "$ICON_TARGET" ]]; then
+  cp "$ICON_TARGET" "$APP/Contents/Resources/Icon.icns"
+fi
+
+# Ensure contents are writable before stripping attributes and signing.
+chmod -R u+w "$APP"
+
+# Strip extended attributes to prevent AppleDouble files that break code sealing.
+xattr -cr "$APP"
+find "$APP" -name '._*' -delete
+
+ENTITLEMENTS_DIR="$ROOT/.build/entitlements"
+DEFAULT_ENTITLEMENTS="$ENTITLEMENTS_DIR/${APP_NAME}.entitlements"
+mkdir -p "$ENTITLEMENTS_DIR"
+
+APP_ENTITLEMENTS=${APP_ENTITLEMENTS:-$DEFAULT_ENTITLEMENTS}
+if [[ ! -f "$APP_ENTITLEMENTS" ]]; then
+  cat > "$APP_ENTITLEMENTS" <<PLIST
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <!-- Add entitlements here if needed. -->
+</dict>
+</plist>
+PLIST
+fi
+
+if [[ "$SIGNING_MODE" == "adhoc" || -z "$APP_IDENTITY" ]]; then
+  CODESIGN_ARGS=(--force --sign "-")
+else
+  CODESIGN_ARGS=(--force --timestamp --options runtime --sign "$APP_IDENTITY")
+fi
+
+# Sign embedded frameworks and their nested binaries before the app bundle.
+sign_frameworks() {
+  local fw
+  for fw in "$APP/Contents/Frameworks/"*.framework; do
+    if [[ ! -d "$fw" ]]; then
+      continue
+    fi
+    while IFS= read -r -d '' bin; do
+      codesign "${CODESIGN_ARGS[@]}" "$bin"
+    done < <(find "$fw" -type f -perm -111 -print0)
+    codesign "${CODESIGN_ARGS[@]}" "$fw"
+  done
+}
+sign_frameworks
+
+codesign "${CODESIGN_ARGS[@]}" \
+  --entitlements "$APP_ENTITLEMENTS" \
+  "$APP"
+
+echo "Created $APP"
diff --git a/macos-spm-app-packaging/assets/templates/setup_dev_signing.sh b/macos-spm-app-packaging/assets/templates/setup_dev_signing.sh
new file mode 100644
index 0000000..42014d1
--- /dev/null
+++ b/macos-spm-app-packaging/assets/templates/setup_dev_signing.sh
@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+# Setup stable development code signing to reduce keychain prompts.
+set -euo pipefail
+
+APP_NAME=${APP_NAME:-MyApp}
+CERT_NAME="${APP_NAME} Development"
+
+if security find-certificate -c "$CERT_NAME" >/dev/null 2>&1; then
+  echo "Certificate '$CERT_NAME' already exists."
+  echo "Export this in your shell profile:"
+  echo "  export APP_IDENTITY='$CERT_NAME'"
+  exit 0
+fi
+
+echo "Creating self-signed certificate '$CERT_NAME'..."
+
+TEMP_CONFIG=$(mktemp)
+trap "rm -f $TEMP_CONFIG" EXIT
+
+cat > "$TEMP_CONFIG" <<EOFCONF
+[ req ]
+distinguished_name = req_distinguished_name
+x509_extensions = v3_req
+prompt = no
+
+[ req_distinguished_name ]
+CN = $CERT_NAME
+O = ${APP_NAME} Development
+C = US
+
+[ v3_req ]
+keyUsage = critical,digitalSignature
+extendedKeyUsage = codeSigning
+EOFCONF
+
+openssl req -x509 -newkey rsa:4096 -sha256 -days 3650 \
+    -nodes -keyout /tmp/dev.key -out /tmp/dev.crt \
+    -config "$TEMP_CONFIG" 2>/dev/null
+
+openssl pkcs12 -export -out /tmp/dev.p12 \
+    -inkey /tmp/dev.key -in /tmp/dev.crt \
+    -passout pass: 2>/dev/null
+
+security import /tmp/dev.p12 -k ~/Library/Keychains/login.keychain-db \
+  -T /usr/bin/codesign -T /usr/bin/security
+
+rm -f /tmp/dev.{key,crt,p12}
+
+echo ""
+echo "Trust this certificate for code signing in Keychain Access."
+echo "Then export in your shell profile:"
+echo "  export APP_IDENTITY='$CERT_NAME'"
diff --git a/macos-spm-app-packaging/assets/templates/sign-and-notarize.sh b/macos-spm-app-packaging/assets/templates/sign-and-notarize.sh
new file mode 100644
index 0000000..2e74bbe
--- /dev/null
+++ b/macos-spm-app-packaging/assets/templates/sign-and-notarize.sh
@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+APP_NAME=${APP_NAME:-MyApp}
+APP_IDENTITY=${APP_IDENTITY:-"Developer ID Application: Example (TEAMID)"}
+APP_BUNDLE="${APP_NAME}.app"
+ROOT=$(cd "$(dirname "$0")/.." && pwd)
+source "$ROOT/version.env"
+ZIP_NAME="${APP_NAME}-${MARKETING_VERSION}.zip"
+
+if [[ -z "${APP_STORE_CONNECT_API_KEY_P8:-}" || -z "${APP_STORE_CONNECT_KEY_ID:-}" || -z "${APP_STORE_CONNECT_ISSUER_ID:-}" ]]; then
+  echo "Missing APP_STORE_CONNECT_* env vars (API key, key id, issuer id)." >&2
+  exit 1
+fi
+
+echo "$APP_STORE_CONNECT_API_KEY_P8" | sed 's/\\n/\n/g' > /tmp/app-store-connect-key.p8
+trap 'rm -f /tmp/app-store-connect-key.p8 /tmp/${APP_NAME}Notarize.zip' EXIT
+
+ARCHES_VALUE=${ARCHES:-"arm64 x86_64"}
+ARCH_LIST=( ${ARCHES_VALUE} )
+for ARCH in "${ARCH_LIST[@]}"; do
+  swift build -c release --arch "$ARCH"
+done
+ARCHES="${ARCHES_VALUE}" "$ROOT/Scripts/package_app.sh" release
+
+ENTITLEMENTS_DIR="$ROOT/.build/entitlements"
+APP_ENTITLEMENTS="${APP_ENTITLEMENTS:-${ENTITLEMENTS_DIR}/${APP_NAME}.entitlements}"
+
+codesign --force --timestamp --options runtime --sign "$APP_IDENTITY" \
+  --entitlements "$APP_ENTITLEMENTS" \
+  "$APP_BUNDLE"
+
+DITTO_BIN=${DITTO_BIN:-/usr/bin/ditto}
+"$DITTO_BIN" --norsrc -c -k --keepParent "$APP_BUNDLE" "/tmp/${APP_NAME}Notarize.zip"
+
+xcrun notarytool submit "/tmp/${APP_NAME}Notarize.zip" \
+  --key /tmp/app-store-connect-key.p8 \
+  --key-id "$APP_STORE_CONNECT_KEY_ID" \
+  --issuer "$APP_STORE_CONNECT_ISSUER_ID" \
+  --wait
+
+xcrun stapler staple "$APP_BUNDLE"
+
+xattr -cr "$APP_BUNDLE"
+find "$APP_BUNDLE" -name '._*' -delete
+
+"$DITTO_BIN" --norsrc -c -k --keepParent "$APP_BUNDLE" "$ZIP_NAME"
+
+spctl -a -t exec -vv "$APP_BUNDLE"
+stapler validate "$APP_BUNDLE"
+
+echo "Done: $ZIP_NAME"
diff --git a/macos-spm-app-packaging/assets/templates/version.env b/macos-spm-app-packaging/assets/templates/version.env
new file mode 100644
index 0000000..6c5435e
--- /dev/null
+++ b/macos-spm-app-packaging/assets/templates/version.env
@@ -0,0 +1,2 @@
+MARKETING_VERSION=0.1.0
+BUILD_NUMBER=1
diff --git a/macos-spm-app-packaging/references/packaging.md b/macos-spm-app-packaging/references/packaging.md
new file mode 100644
index 0000000..acaf317
--- /dev/null
+++ b/macos-spm-app-packaging/references/packaging.md
@@ -0,0 +1,17 @@
+# Packaging notes
+
+## Build output paths
+SwiftPM places binaries under:
+- `.build/<arch>-apple-macosx/<config>/<AppName>` for arch-specific builds
+- `.build/<config>/<AppName>` for some products (frameworks/tools)
+
+Use `ARCHES="arm64 x86_64"` with `swift build` to produce universal binaries.
+
+## Common environment variables (used by templates)
+- `APP_NAME`: App/binary name (for example, `MyApp`).
+- `BUNDLE_ID`: Bundle identifier (for example, `com.example.myapp`).
+- `ARCHES`: Space-separated architectures (default: host arch).
+- `SIGNING_MODE`: `adhoc` to avoid keychain prompts in dev.
+- `APP_IDENTITY`: Codesigning identity name for release builds.
+- `MACOS_MIN_VERSION`: Minimum macOS version for Info.plist.
+- `MENU_BAR_APP`: Set to `1` to add `LSUIElement` to Info.plist.
diff --git a/macos-spm-app-packaging/references/release.md b/macos-spm-app-packaging/references/release.md
new file mode 100644
index 0000000..cbcd127
--- /dev/null
+++ b/macos-spm-app-packaging/references/release.md
@@ -0,0 +1,14 @@
+# Release and notarization notes
+
+## Notarization requirements
+- Install Xcode Command Line Tools (for `xcrun` and `notarytool`).
+- Provide App Store Connect API credentials:
+  - `APP_STORE_CONNECT_API_KEY_P8`
+  - `APP_STORE_CONNECT_KEY_ID`
+  - `APP_STORE_CONNECT_ISSUER_ID`
+- Provide a Developer ID Application identity in `APP_IDENTITY`.
+
+## Sparkle appcast (optional)
+- Install Sparkle tools so `generate_appcast` is on PATH.
+- Provide `SPARKLE_PRIVATE_KEY_FILE` (ed25519 key).
+- The appcast script uses your zip artifact to create an updated `appcast.xml`.
diff --git a/macos-spm-app-packaging/references/scaffold.md b/macos-spm-app-packaging/references/scaffold.md
new file mode 100644
index 0000000..1eee900
--- /dev/null
+++ b/macos-spm-app-packaging/references/scaffold.md
@@ -0,0 +1,79 @@
+# Scaffold a SwiftPM macOS app (no Xcode)
+
+## Steps
+1) Create a repo and initialize SwiftPM:
+```
+mkdir MyApp
+cd MyApp
+swift package init --type executable
+```
+
+2) Update `Package.swift` to target macOS and define an executable target for the app.
+
+3) Create the app entry point under `Sources/MyApp/`.
+- Use SwiftUI if you want a windowed app with minimal AppKit glue.
+- Use AppKit if you want a menu bar or accessory-style app.
+
+4) If you need app resources, add:
+```
+resources: [.process("Resources")]
+```
+and create `Sources/MyApp/Resources/`.
+
+5) Add a `version.env` file (used by packaging templates):
+```
+MARKETING_VERSION=0.1.0
+BUILD_NUMBER=1
+```
+
+6) Copy script templates from `assets/templates/` into your repo (for example, `Scripts/`).
+
+## Minimal Package.swift (example)
+```
+// swift-tools-version: 6.2
+import PackageDescription
+
+let package = Package(
+    name: "MyApp",
+    platforms: [.macOS(.v14)],
+    targets: [
+        .executableTarget(
+            name: "MyApp",
+            path: "Sources/MyApp",
+            resources: [
+                .process("Resources")
+            ])
+    ]
+)
+```
+
+## Minimal SwiftUI entry point (example)
+```
+import SwiftUI
+
+@main
+struct MyApp: App {
+    var body: some Scene {
+        WindowGroup {
+            Text("Hello")
+        }
+    }
+}
+```
+
+## Minimal AppKit entry point (example)
+```
+import AppKit
+
+final class AppDelegate: NSObject, NSApplicationDelegate {
+    func applicationDidFinishLaunching(_ notification: Notification) {
+        // Initialize app state here.
+    }
+}
+
+let app = NSApplication.shared
+let delegate = AppDelegate()
+app.delegate = delegate
+app.setActivationPolicy(.regular)
+app.run()
+```