Copy core@v0.20.3 render/blocknote.go (+ tests) with the blocks import repointed to pluginsdk/blocks, so GetEmbedResolver/GetHumanProofBanner read the same context keys the pluginsdk bridge writes. Fixes empty embeds and missing human-proof banners in hosts that inject render state via pluginsdk/blocks context. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>