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The ~component check in _aser immediately serialized all names starting with ~ as unexpanded component calls. This meant defmacro definitions like ~root-header-auto were sent to the client unexpanded, causing "Undefined symbol: root-header-ctx" errors since IO primitives only exist server-side. Now checks env for Macro instances first. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>