Add configuration options for notifications

**Description**
Currently validation lacks proper sorting support.

**Proposed solution**
Add configurable sorting with sensible defaults.

**Priority**: Low/Medium

Start by locating the validation and notification configuration entry points in the repository. Compare the issue's proposed sorting behavior with existing configuration conventions and tests, if present. Done means sorting is configurable and has sensible defaults, but the issue does not identify specific files, commands, or expected ordering.

Written by the indexing model from the issue text.