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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>