Apply cwd to bash kernel contexts

[mishushakov]

Summary

• change_current_directory in template/server/messaging.py handled python, javascript/typescript, r, and java but fell through to a no-op for bash, so a context created with a non-default cwd still returned / from pwd.
• Added a bash branch that sends cd <path> to the kernel, plus bash cwd tests across sync/async Python and JS suites (the gap that let this regression slip in).
• Changeset: patch bump for @e2b/code-interpreter-template.

Refs: e2b-dev/E2B#1318

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[cursor]

PR Summary

Low Risk
Small, isolated change to the bash cwd setup plus added tests; low risk aside from potential quoting/escaping edge cases in cd commands.

Overview
Bash kernels were not applying the requested cwd, so commands like pwd could still report /; change_current_directory now issues a cd for language == "bash".

Adds bash cwd assertions to the JS and Python (sync/async) test suites and includes a patch changeset for @e2b/code-interpreter-template.

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