Support timeout configuration

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

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

**Priority**: Low/Medium

Start by tracing the existing validation and notification behavior, using the issue title and description to resolve whether timeout configuration or notification configuration is the intended scope. Done means the agreed configuration is supported and sensible defaults are covered by the relevant validation or notification checks.

Written by the indexing model from the issue text.