perf(mcp): Replace redundant LLM usages with deterministic logic

- Refactored memory_consolidation_worker to use purely deterministic string normalization ((N)$ regex stripping & lowercase) instead of passing graph entities to Ollama for duplication detection.
- Removed redundant Ollama architectural summarization from log_code_change tool since the agent already provides a descriptive summary.
- Removed redundant Ollama fix summarization from log_error_fix tool since the agent already provides a solution string.

server/src/handlers/meta.rs

@@ -24,24 +24,7 @@ impl McpTool for LogErrorFixHandler {
     async fn execute(&self, args: Value, state: Arc<MemoryState>) -> crate::error::Result<String> {
         let req: LogErrorFixTool = serde_json::from_value(args).map_err(|e| e.to_string())?;
         let text_to_embed = format!("Signature: {}\nSolution: {}", req.signature, req.solution);
-        let mut solution = req.solution;
-
-        if state.ollama.is_available().await {
-            let prompt = format!(
-                "Analyze this error signature and solution. Output 1 sentence summarizing the root cause and fix:\nSignature: {}\nSolution: {}",
-                req.signature, solution
-            );
-            if let Ok(summary) = state
-                .ollama
-                .generate(&prompt, Some(&state.ollama.reasoning_model), None, None)
-                .await
-            {
-                let clean = summary.trim();
-                if !clean.is_empty() {
-                    solution = format!("{} (AI Analysis: {})", solution, clean);
-                }
-            }
-        }
+        let solution = req.solution;
 
         let embedding = crate::embedding::generate_embedding_async(text_to_embed)
             .await
@@ -204,18 +187,6 @@ impl McpTool for LogCodeChangeHandler {
             description = format!("{} [Symbols: {}]", description, symbols.join(", "));
         }
 
-        if state.ollama.is_available().await {
-            let prompt = format!(
-                "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, None).await {
-                let clean = summary.trim();
-                if !clean.is_empty() {
-                    description = format!("{} (AI Summary: {})", description, clean);
-                }
-            }
-        }
         let change_kind = match req
             .change_kind
             .as_deref()