feat(server): embed LLM handshake instructions in MCP initialization

server/src/router.rs

@@ -136,7 +136,8 @@ impl MemoryHandler {
                 .with_server_info(rmcp::model::Implementation::new(
                     "gemini-mcp-memory",
                     "3.0.0",
-                ));
+                ))
+                .with_instructions(include_str!("instructions.md"));
                 Some(crate::mcp::success(
                     id,
                     serde_json::to_value(&init).unwrap_or_default(),