feat(ollama): enforce JSON logits & add nvim_buffer edit action

- Added format parameter to Ollama generate for JSON logit enforcement.

- Implemented safe edit action in nvim_buffer MCP tool to replace raw Lua.

server/src/handlers/meta.rs

@@ -33,7 +33,7 @@ impl McpTool for LogErrorFixHandler {
             );
             if let Ok(summary) = state
                 .ollama
-                .generate(&prompt, Some(&state.ollama.reasoning_model), None)
+                .generate(&prompt, Some(&state.ollama.reasoning_model), None, None)
                 .await
             {
                 let clean = summary.trim();
@@ -207,7 +207,7 @@ impl McpTool for LogCodeChangeHandler {
                 "Summarize in 1 concise sentence the architectural impact of changing file '{}': {}",
                 req.file_path, description
             );
-            if let Ok(summary) = state.ollama.generate(&prompt, None, None).await {
+            if let Ok(summary) = state.ollama.generate(&prompt, None, None, None).await {
                 let clean = summary.trim();
                 if !clean.is_empty() {
                     description = format!("{} (AI Summary: {})", description, clean);