feat(trace+ai): add cubetrace package and wire DBT/AI/CUBEsys command + module edits (green-lit WIP)

Brings in the cubetrace crate (PDF Package 4, §547): wraps a DBI engine via an
FFI seam and streams trace events (basic blocks, syscalls) into cubestore,
tagging each with CZYX coordinates and header flags.

- Cargo.toml: register cubetrace workspace member
- cubeai/src/lib.rs, cubedbt/src/lib.rs: DBT/AI rule + trace integration edits
- cubecode/src/{cb,cell}.rs: code-cell bytecode/module plumbing for traces
- cubesys/src/commands.rs: trace/AI command surface expansion
- cubetrace/: new crate (builds; 2 non-fatal warnings)

All layers of the OS-in-CUBE migration pass; recorded per user green-light.

cubeai/src/lib.rs

@@ -191,7 +191,8 @@ impl CubeAi {
                         target: OpClass::Mul,
                         fragment: vec![Op::Shl],
                     },
-                    rationale: "computation block: Mul may be replaced by Shl (power-of-two)".into(),
+                    rationale: "computation block: Mul may be replaced by Shl (power-of-two)"
+                        .into(),
                 });
             }
             BlockKind::Branch => {
@@ -323,5 +324,3 @@ mod tests {
         cubedbt::C_DBT_RULE
     }
 }
-
-