[ deymosh/umbra ] refactor(nip25): drop unused reaction helpers that contradicted NIP-25
extractReactionTarget took the first e/p tag where NIP-25 makes the last one the target, and isPositiveReactionContent called emoji reactions other than a heart or thumbs-up negative. Neither had a caller; counting uses engagementLinksOf and isDislikeReactionContent.
Co-Authored-By: Claude Code <noreply@anthropic.com>
https://github.com/deymosh/umbra/commit/ac6655a719dcfd9780670ca589d16604b9da2b44