Closes#65
Declare an Update URI header and answer core's update_plugins_{hostname}
filter from a new Update\UpdateChecker that offers the latest published
Gitea release's zip asset when it is newer than the installed version,
with transient caching and silent degradation on API failures.
Add a release workflow that fires on v* tag pushes: verifies the tag
matches the plugin Version header, runs the tests, builds the plugin zip,
and attaches it to the release (reusing a UI-created release, flagging
hyphenated versions as pre-release so /releases/latest skips them).
Co-Authored-By: Claude Fable 5 <[email protected]>
