fix: select memoryproof as the default cargo binary

Author: Hughhhhcoder

crates/forgetproof/Cargo.toml

@@ -4,6 +4,7 @@ version.workspace = true
 edition.workspace = true
 license.workspace = true
 description = "Assurance tests for AI agent memory / AI Agent 记忆保障测试"
+default-run = "memoryproof"
 
 [dependencies]
 anyhow.workspace = true