Support bundled ipykernel for reticulate sessions - #1404
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Report the embedded interpreter without importing ipykernel. Accept optional import paths in the kernel-start RPC and prepend them before launching the kernel. Add opt-in integration coverage for project environments with bundled packages and managed environments with and without the bundle.
Keep the Ark change focused on interpreter metadata and kernel import paths. The full Positron bundle startup integration does not belong here.
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Python (reticulate) sessions can fail to start when the project's Python environment lacks
ipykernel, even when the user's code doesn't depend on it. Users see an error aboutpositron_ipykernel, as reported in this comment.Positron already ships
ipykernel. This adds the Ark support needed to make that bundled copy available toreticulate. Ark reports which Python version and architecture are running inside R, then accepts the locations of the matching packages before starting the kernel.A companion Positron PR posit-dev/positron#16045 supplies those locations. Existing callers can omit them and continue using packages installed in their Python environment.