abi-capability-surface.md is the canonical plugin-need → ABI-mechanism map
(manifest / host_call / hook), with WZ-020 rows marked. wasm-abi.md: content
family drift fixed (list_posts), new families and hooks documented, open
items closed except slot/media/embed render resolvers.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
