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fix: demand-gate and tear down nested streams in server function results (#3125)

The demand gate and teardown registry now ride guardFailures' walk
through the result graph instead of wrapping only a top-level
async-iterable value. Every source the codec pumps — nested iterables
and ReadableStreams included — parks behind the response queue's demand
and registers an idempotent closer with the response teardown, so
`{ items: rows() }` gets the same backpressure and cancel/abort
teardown as `return rows()`. The gate's waiter is now a list woken
wholesale per pull: the codec pumps sources concurrently, and waking
one would strand the rest when it steps to done without enqueuing.
Server-only code (the shared client half is untouched).

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

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