Fix streaming hang when passing string to stream() method

[delay]

Summary

When passing a string directly to the stream() method in kokoro.js, the TextSplitterStream was not being closed after pushing the text chunks. This caused the async iterator to hang indefinitely waiting for more input that would never come.

The Bug

In kokoro.js/src/kokoro.js, when the stream() method receives a string input, it:

1. Creates a new TextSplitterStream
2. Splits the text into chunks
3. Pushes the chunks to the splitter

However, it never called splitter.close() to signal that no more input would be coming. This caused any code iterating over the stream to hang forever after processing all chunks.

The Fix

Added a call to splitter.close() after pushing the chunks to properly signal end-of-input:

splitter.push(...chunks);
// Close the stream to signal no more input is coming
// This fixes a bug where the async iterator would hang waiting for more input
splitter.close();

Testing

Tested by using the stream() method with string input in a Node.js application. Before the fix, the async iteration would hang indefinitely. After the fix, it completes normally when all chunks have been processed.

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