Remove Deno kernel

[mishushakov]

Summary

• Drops the Deno Jupyter kernel from the sandbox template (removed deno.json kernel spec, install step, and DENO_INSTALL/DENO_VERSION env vars).
• Removes the (already-skipped) Deno language tests from both the Python and JS SDKs.
• Cleans up deno branches in template/server/messaging.py for env-var set/delete and change_current_directory.

Test plan

• CI passes (no Deno install step remains in template builds).
• Existing language tests (python, javascript, r, bash, java) still pass.

🤖 Generated with Claude Code

[cursor]

PR Summary

Medium Risk
Removes Deno kernel installation/config and related server-language branches, which can break any users or integrations that still invoke language: "deno" or expect the kernel to exist.

Overview
Deno kernel support is removed from the template build (no deno.json, no install step, and no Deno env vars), and the server no longer emits Deno-specific snippets for env var set/delete or change_current_directory. The (previously skipped) Deno language tests are deleted from both the JS and Python test suites, and a changeset bumps @e2b/code-interpreter-template as a minor release.

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[claude]

LGTM — straightforward removal of the Deno Jupyter kernel from the template.

Extended reasoning...

Overview

This PR removes the Deno Jupyter kernel from the sandbox template. It deletes template/deno.json, the Deno install step and DENO_INSTALL/DENO_VERSION env vars in template/template.py, the deno branches in messaging.py for env-var set/delete and change_current_directory, and the already-skipped Deno language tests from both the Python and JS SDKs.

Security risks

None. The change only removes code paths and an external install step (deno install). Removing the install actually reduces the sandbox's attack surface.

Level of scrutiny

Low. This is a mechanical removal of an unused/disabled feature — the language tests being removed were all marked @pytest.mark.skip or .skip with reason 'Deno is not supported yet', and the kernel from make_template defaults is dropped consistently. The remaining deno references in the repo (js/tests/runtimes/deno, workflow file, package.json script) are for testing the JS SDK from a Deno runtime, which is a separate concern from the in-sandbox Deno kernel being removed here.

Other factors

The changes across the three affected files are internally consistent: messaging.py no longer needs Deno branches because deno will never be passed as self.language once the kernel isn't installed, and template.py's default kernel list is updated. No bugs found by the bug hunting system.