feat: enhance safety and crash resilience in file operations; add fsync to critical writes and checks for path traversal

src/tool/git_worktree.rs

@@ -47,6 +47,9 @@ impl Tool for GitWorktree {
             .and_then(|v| v.as_str())
             .ok_or_else(|| anyhow!("missing required argument: name"))?
             .to_string();
+        if name.contains('/') || name.contains('\\') || name.contains("..") {
+            anyhow::bail!("worktree name must not contain path separators or '..'");
+        }
         let base_ref = args.get("base_ref")
             .and_then(|v| v.as_str())
             .ok_or_else(|| anyhow!("missing required argument: base_ref"))?