feat(lexicon): add PostView types and update feed schema master
Extends post types to support feed views and updates lexicon definitions: Post Types Added: - PostView: Full post representation with all metadata for feeds - AuthorView: Author info (DID, handle, displayName, avatar, reputation) - CommunityRef: Minimal community reference in posts - PostStats: Aggregated statistics (votes, comments, shares) - ViewerState: User's relationship with post (votes, saves, tags) Lexicon Updates: - social.coves.post.get: Restructured postView definition - social.coves.feed.getCommunity: Updated query parameters and response These types align with atProto patterns: - Follows app.bsky.feed.defs#feedViewPost structure - Supports viewer-specific state - Enables efficient feed rendering - Provides all data clients need in single request The PostView types are used by feed endpoints to return rich post data. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>