Run each kernel under a scrubbed environment so untrusted code can never read
the host's secrets. A custom 'docsgpt-python' kernelspec launches ipykernel
through a wrapper that keeps only what the kernel needs (PATH, HOME, LANG, and
the Jupyter runtime/data dirs), dropping API keys, tokens, the database URL, and
the gateway token. The app selects this kernel by name via SANDBOX_KERNEL_NAME,
so the distinct name is never shadowed by the stock python3 spec. Per-session
workspaces are created mode 0700 (defense in depth under the shared uid). The
README documents the runner as a single trust domain and points to the Daytona
backend for per-tenant isolation.
Alex
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