[FEATURE_REQUEST] llama.cpp Text Completion `top_n_sigma`

[Beinsezii]

Have you searched for similar requests?

No

Is your feature request related to a problem? If so, please describe.

Server supports top_n_sigma as of today since this PR was merged ggml-org/llama.cpp#13264 so it needs to be enabled in ST

tl;dr:

new default ordering
[ "penalties", "dry", "top_n_sigma", "top_k", "typ_p", "top_p", "min_p", "xtc", "temperature" ]

short-circuit check for top_n_sigma < 0.0f so UI needs to go to -1 I suppose?
https://github.com/ggml-org/llama.cpp/blob/15a28ec8c705b188ebe178170966d1dcc36fe151/src/llama-sampling.cpp#L1753

Describe the solution you'd like

Think it's slightly beyond what I consider a quick copy paste job because it needs new entries to the ordering UI and such.

Describe alternatives you've considered

No response

Additional context

No response

Priority

Low (Nice-to-have)

Are you willing to test this on staging/unstable branch if this is implemented?

None

[github-actions]

✅ It looks like all or part of this issue has now been implemented as part of the staging branch. If you currently are on the release branch, you can switch to staging to test this right away.
Note that staging is considered less stable than the official releases. To switch, follow existing instructions, or simply enter the following command: git switch staging

[Beinsezii]

I cherry-picked #3961 locally and its running good