Llama.cpp PR adds DeepSeek-V4.1-Flash support with review fixes

An automated code review identified several issues requiring attention before the code can be merged. Key concerns include an empty PR description that violates contribution guidelines, potential process aborts from using assertions instead of clamping for user-supplied image dimensions, and a missing key in the model saver that could cause silent failures when round-tripping DSpark drafts. The review also flagged a global behavior change in context embedding toggling and a numerical precision update to the softplus operation that affects all models.

The review noted that while the Engram metadata handling is secure and the vision kernel fix is correct, the PR bundles unrelated changes. Maintainers are advised to split the ggml numeric tweaks into a separate pull request and ensure the dense attention path is tested in CI to prevent regression. The overall assessment is that the code is structurally sound but requires these process and robustness fixes.