Bridge release 1.13.1: an update check that reads the minimum macOS

[sevmorris]

The bridge release, 1.13.1, on the current minimum macOS. It ships an update check that reads the minimum macOS each release declares, so the later "Require macOS 15" release isn't offered to Macs that can't run it. It's also the first real run of release.sh's new test step.

What

• Update check: the checker reads a <!-- minimum-macos: X --> marker from the release notes. When the newest release is newer than this build but needs a newer macOS than this Mac has:

  • Check for Updates… says which macOS that release needs, and that the installed version is the newest this Mac can run;
  • the check at launch stays quiet;
  • no Download is offered.

  A release with no marker, or a malformed one, is offered as before.

• The toolbar badge is cleared for such a release. The tests go in `BarkeepTests.swift`, since a new file would need a hand edit to `project.pbxproj`.

• release.sh reads LSMinimumSystemVersion from the built app before notarizing, and stops there if it's missing. It appends a "Requires macOS X or later." line and the marker to the GitHub release notes, curated or generated.

• release-notes/v1.13.1.md drafted.

Checked

• Built for testing with Xcode 27: no errors, and no warnings in the changed files.
• The new tests compile into the test target.
• zsh -n release.sh passes.
• PlistBuddy reads the right minimum from the installed app.
• The marker parser's tests pass (run locally in ClipHack, the same code as here).

To release

Merge, let CI go green, then caffeinate -dis ./release.sh 1.13.1.

🤖 Generated with Claude Code