Add lexicon definitions for comment query API following Bluesky patterns: - social.coves.community.comment.defs: Shared view definitions - commentView: Base view for single comment with stats and viewer state - threadViewComment: Recursive wrapper for threaded replies - Supporting types: commentStats, commentViewerState, commentRef, etc. - social.coves.community.comment.getComments: Query endpoint - Parameters: post (required), sort, depth, limit, cursor, timeframe - Returns threaded comments with nested replies up to depth limit - Supports hot/top/new sorting with Lemmy-style hot ranking Follows atproto best practices: - Composition pattern (threadView wraps baseView) - Union types for error states (notFound, blocked) - Open unions for future extensibility - Strong references with CID version pinning 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>