This PR adds an extension to enable Next Edit Suggestions with Posit AI (closes posit-dev#13334). Suggestions should begin to appear automatically if you are logged into Posit AI via either Positron Assistant or Posit Assistant. Suggestions should show either as ghost text or NES, <img width="240" height="116" alt="Screenshot 2026-04-29 at 16 36 14" src="https://github.com/user-attachments/assets/db319320-a281-476d-8f60-4adaa4795c5e" /> <img width="284" height="143" alt="Screenshot 2026-04-29 at 16 36 32" src="https://github.com/user-attachments/assets/15d7b7e8-f7a5-496d-9ec4-7c08045b0db4" /> Debugging output (at trace level) should be visible in the Output pane under "Next Edit Suggestions" when completions are working as expected with feedback being fed back when a suggestion is "accepted", "rejected" or "ignored", <img width="758" height="131" alt="Screenshot 2026-04-29 at 16 38 04" src="https://github.com/user-attachments/assets/dfa9b5e6-f51b-4847-be33-9dac18dcca9c" /> ### LSP script The NES LSP server script is `langauge-server.js`. This is built, bundled and minified as part of the build process in a different repo (it is also used to supply NES in RStudio). The resulting output is bundled verbatim here. Whenever we need to supply updates to how the NES system talks to the LLM providers we can do so by updating and replacing the bundled LSP script. Authentication for Posit AI is obtained via the `authentication` extension, and then passed to the LSP script. ## QA Both Copilot and Posit AI completions return in similar ways, and if you have both enabled the first to return will win. So, if you want to ensure you are seeing and accepting only Posit AI completions, set this in your `settings.json` to temporarily disable copilot's completions. ``` "github.copilot.enable": {"*": false}, ``` Note that the Next Edit Suggestions extension has been set up to honour the old `positron.assistant.enable` setting, in case admins have set that up at some point, so make sure that is true or removed from your `settings.json` entirely. https://github.com/user-attachments/assets/d4fb1f43-1c2d-4d0b-9cbc-01cbec973617 --- ### Release Notes #### New Features - Add Posit AI Next Edit Suggestions (posit-dev#13334) --------- Signed-off-by: George Stagg <georgestagg@gmail.com> Co-authored-by: sharon <sharon-wang@users.noreply.github.com>

Add Posit AI Next Edit Suggestions #13334

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