Fix formatting and example lint after shroud->noxis rename

- cargo fmt --all: shorter crate identifiers reflowed `use {...}` lists
- noxis/examples/dbg.rs: allow unwrap_used/expect_used (scratch harness),
  add module doc

crates/noxis-core/src/pipeline/mod.rs

@@ -3,8 +3,8 @@
 pub mod context;
 pub mod report;
 
-use serde::Serialize;
 use noxis_classfile::Program;
+use serde::Serialize;
 
 use self::context::Context;
 use self::report::Report;