Rename project from xserial to pipeview

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

crates/pipeview-core/src/lib.rs

@@ -0,0 +1,7 @@
+pub mod error;
+pub mod frame;
+pub mod pipeline;
+pub mod protocol;
+pub mod transport;
+
+pub use error::{Error, Result};