Switch to Qwen2.5-Coder.

Signed-off-by: Gabriel Linder <linder.gabriel@gmail.com>

Author: dargor

.vim-ai.vim

@@ -1,7 +1,8 @@
 let s:vim_ai_endpoint_url = "http://localhost:11434/v1/chat/completions"
 
-let s:vim_ai_model = "mistral-nemo:12b-instruct-2407-q8_0"
-let s:vim_ai_temperature = 0.3
+let s:vim_ai_model = "qwen2.5-coder:14b-instruct-q6_K"
+let s:vim_ai_temperature = 0.7
+let s:vim_ai_top_p = 0.8
 
 let s:vim_ai_chat_prompt =<< trim END
 >>> system
@@ -10,19 +11,21 @@ You are a helpful code assistant.
 
 Assume that all unknown symbols are properly initialized elsewhere.
 
-Add a syntax type after ``` to enable proper syntax highlighting in fenced code blocks.
+Add a syntax type after ``` to enable proper syntax highlighting.
 END
 
 let s:vim_ai_edit_prompt =<< trim END
 >>> system
 
 You will act as a code generator.
 
-Do not write any introduction, conclusion, or explanation.
+You must satisfactorily meet the request with as few changes as possible.
+
+Write your answer directly as plain text, without fences or headings to delimit it.
 
-Do not use fenced code blocks.
+Do not write any introduction, conclusion, or explanation.
 
-Respect the original indentation level.
+Make sure to keep the initial indentation level.
 END
 
 let s:vim_ai_chat_config = #{
@@ -31,6 +34,7 @@ let s:vim_ai_chat_config = #{
 \    model: s:vim_ai_model,
 \    initial_prompt: s:vim_ai_chat_prompt,
 \    temperature: s:vim_ai_temperature,
+\    top_p: s:vim_ai_top_p,
 \    endpoint_url: s:vim_ai_endpoint_url,
 \    enable_auth: 0,
 \    max_tokens: 0,
@@ -47,6 +51,7 @@ let s:vim_ai_edit_config = #{
 \    model: s:vim_ai_model,
 \    initial_prompt: s:vim_ai_edit_prompt,
 \    temperature: s:vim_ai_temperature,
+\    top_p: s:vim_ai_top_p,
 \    endpoint_url: s:vim_ai_endpoint_url,
 \    enable_auth: 0,
 \    max_tokens: 0,