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/bin/dump_schema.rs

@@ -0,0 +1,6 @@
+use mcp_memory_server::tools::{DecisionsTool, TechDebtTool, ManageCheckpointTool, HypothesesTool, AgentSignalsTool};
+use schemars::schema_for;
+
+fn main() {
+    println!("{}", serde_json::to_string_pretty(&schema_for!(AgentSignalsTool)).unwrap());
+}