fix: allow processing multiple terminal responses from WASM

[eexwhyzee]

this fix addresses a hanging issue when terminal integrations that buffer incoming data during async initialization (for example: https://github.com/jupyterlab/jupyterlab/blob/main/packages/terminal/src/widget.ts#L75-L115) can trigger multiple terminal query responses in a single write call.

things like neovim/nushell that send multiple queries and block waiting for responses, which hangs because currently only the first response was being sent back.

for example, trying to run neovim in jupyterlab would hang after the first response:

after the fix, neovim starts up successfully in jupyterlab:

[sreya]

Awesome thanks for this

[sreya]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Another round soon, please!

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