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Forbid wrapped module-level "use server" exports

Module-level directive files must export precisely the server functions:
the client build replaces each export with a direct network reference, so
a call wrapper around an export either hoists server-module code into the
client or silently diverges between builds — and never applies to HTTP
dispatch, which invokes the registered inner function. The compiler now
rejects wrapped exports (aliases traced, GET included — no wrapper is
recognized by name) with an error directing to the function-level
directive. Reverses the wrapper-transplant behavior from #3052; records
the invariant and its rationale in RFC 10.

Co-authored-by: Cursor <cursoragent@cursor.com>

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