docs: reflect cubecli as standalone crate in README + integration docs

The  binary was extracted to  in a prior session; the
docs still referenced  as its home.

Co-Authored-By: Hermes Agent (upstage/solar-pro4:free)

cubesys/docs/integration.md

@@ -76,9 +76,11 @@ the spec never defined.
 ## Binaries
 
 * `cube-demo` — self-contained tour (write two linked cells, run; seal a
-  record, reopen + run). Prints evidence at each step.
+  record, reopen + run). Prints evidence at each step. (in `cubesys`)
 * `cube` — CLI: `write`, `run`, `ls`, `stat`, `seal`, `open` over one store,
   interactively (`repl`), from a file (`script`), or as the demo (`demo`).
+  Now a standalone crate (`cubecli/`); identical behavior to the former
+  `cubesys/src/bin/cube.rs`.
 * `cube-server` — long-lived daemon: holds ONE `CubeStore` for its whole
   lifetime and serves the same command language over a Unix-domain socket.
   Snapshots the store to a JSON file on every request so the cube survives