Only index cards and comments if their card is `published?`, using a
new method `searchable?` that is implemented on both Card and Comment.
This prevents draft cards and their comments from being indexed.
When drafts are published, the existing `update_in_search_index`
callback creates the record via `upsert!`, or else ensures unpublished
records are removed from the index.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Mike Dalessio
0d138df952