v2.2.0 binary targets macOS 26 despite declaring macOS 13

[122yjs]

Bug description

The v2.2.0 release cannot be launched on macOS 15 Sequoia even though the app's Info.plist declares macOS 13.0 as the minimum version.

macOS displays a compatibility message saying that this version of KeepAgentAwake.app cannot be used with the installed macOS version.

Environment

• macOS 15.7.7 Sequoia (24G720)
• Apple Silicon (arm64)
• KeepAgentAwake v2.2.0 DMG release

Release binary inspection

The app bundle declares:

LSMinimumSystemVersion = 13.0

But the Mach-O executable was built with:

LC_BUILD_VERSION
  platform macOS
  minos 26.0
  sdk 26.5

Command used:

xcrun vtool -show-build \
  KeepAgentAwake.app/Contents/MacOS/KeepAgentAwake

Because the binary deployment target is macOS 26.0, LaunchServices correctly refuses to run it on Sequoia despite the conflicting Info.plist value.

Source-build issue on Sequoia

Building the unmodified v2.2.0 source on the same Mac also stops during icon generation:

build/AppIcon.iconset:Invalid Iconset.

This comes from the iconutil -c icns step in build.sh.

Expected behavior

• The built executable's deployment target should match LSMinimumSystemVersion (13.0).
• A source build should complete on a supported macOS release.
• The resulting app should have a valid ad-hoc signature for local distribution.

Proposed fix

Read the minimum version from Info.plist and pass it explicitly to swiftc:

DEPLOYMENT_TARGET=$(/usr/libexec/PlistBuddy \
  -c 'Print :LSMinimumSystemVersion' Info.plist)
TARGET_ARCH=$(uname -m)

swiftc \
  -target "$TARGET_ARCH-apple-macos$DEPLOYMENT_TARGET" \
  ...

Also verify after each build that the Mach-O minos value matches the plist value. I have a tested fix on macOS 15.7.7 and will open a draft PR linked to this issue.