Add sensor freshness checks

AUDIT.md

@@ -91,3 +91,18 @@ API references used to check migration and entity-registry calls:
 [HA config entries](https://developers.home-assistant.io/docs/config_entries_index/),
 [config migration](https://developers.home-assistant.io/docs/config_entries_config_flow_handler/#config-entry-migration),
 [entity registry](https://contributors.home-assistant.io/core/integrations/entity-registry/).
+
+
+## Follow-up: configurable freshness
+
+The freshness portion of finding 1 is now addressed: room/weather report-age
+limits, stale-source fallback, recovery without cross-gap learning and per-source
+quality reasons are implemented. Defaults are 30/120 minutes and both limits are
+editable in setup/Options with English and Romanian labels. This supersedes the
+original audit's statement that stale numeric readings are accepted. Physical
+measurement timestamps, source alignment, cached-provider detection and HAOS
+validation remain open. See README for compatibility and safe trial details.
+
+The suite now has 42 passing offline tests. Compilation with the temporary cache
+and `git diff --check` pass. The API basis is HA's
+[state timestamp documentation](https://www.home-assistant.io/docs/configuration/state_object/).