Align PostView and CommentView with atProto patterns by accessing content through the Record object instead of redundant top-level fields. This matches the Bluesky approach where the record contains the authoritative content. Changes: - Remove content field from CommentView (access via Record.Content) - Remove title/text fields from PostView (access via Record) - Update lexicons to remove redundant field definitions - Update comment_service, feed_repo_base, post_repo to stop setting removed fields - Add test for deleted comments with nil Record - Add helper functions in integration tests to extract content from Record Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>