v5.3.1

• Fix: A hook namespace no longer swallows packages whose name merely starts with it.
  Section ownership now requires an exact [namespace] match or a [namespace:subsection]
  prefix (the : separator cannot occur in a package name), so a hook like uv no longer
  silently drops packages such as uvst.addon. Hook config sections previously written as
  [namespace-section] must be renamed to [namespace:section].
  [jensens]