mtmd: clarify that we no longer accept AI-generated PRs (#18406)

tools/mtmd/models/models.h

@@ -2,6 +2,11 @@
 
 #include "../clip-graph.h"
 
+/*
+ * IMPORTANT: The mtmd module does NOT accept pull requests that are fully or predominantly AI-generated.
+ * We encourage human contributors to ensure the quality and reliability of the codebase.
+ */
+
 struct clip_graph_siglip : clip_graph {
     clip_graph_siglip(clip_ctx * ctx, const clip_image_f32 & img) : clip_graph(ctx, img) {}
     ggml_cgraph * build() override;

tools/mtmd/mtmd.h

@@ -27,6 +27,9 @@
  * - Make sure the C API is aligned with the libllama C API (as in llama.h)
  * - Do not include model name (e.g., qwen, gemma) in the API, use generic terms instead
  * - Keep the API minimal, do not expose internal details unless necessary
+ *
+ * IMPORTANT: The mtmd module does NOT accept pull requests that are fully or predominantly AI-generated.
+ * We encourage human contributors to ensure the quality and reliability of the codebase.
  */
 
 #ifdef LLAMA_SHARED