Update to cockle 0.0.12, adding tree and vim commands

[ianthomas23]

Update to cockle 0.0.12, adding tree and vim commands.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
jupyterlite-terminal	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 13, 2024 8:19am

[ianthomas23]

Observations from the vercel preview:

• Initial download of vim command takes ~20 seconds for me, on my low bandwidth (remote location) internet connection. It is cached of course, so subsequent uses are quick. It might be a good idea to add some signals for the start and end of downloads so that there is the possibility of notifying the user in the UI, either within the terminal itself (animated cursor?), or a more general JupyterLite mechanism as I know this is intended for download of kernel packages.
• I have introduced an occasional crash in the use of Atomics to transfer stdout to the terminal, which needs investigating.