feat(workout): create standalone app path

Add a workout new PATH command that copies the Workout exemplar into a standalone app with local hemx path dependencies, verifies its manifest in xtask tests, and documents the create/check path.

req: examples/001

req: examples/006

examples/workout/README.md

@@ -7,6 +7,17 @@ final export shared or replayed, and invalid input, replay failure, or host deni
 recovered without storing DOM patches or UI update payloads as truth.
 req: examples/001 req: local/001 req: local/003 req: local/004
 
+## Create
+
+```sh
+cargo run -p hemx-xtask -- workout new /tmp/my-workout-app
+cargo check --manifest-path /tmp/my-workout-app/Cargo.toml
+```
+
+The created app is standalone: it points at local hemx crates, owns its
+command/event/projection state, and keeps Android/iOS signing outside the repo.
+req: examples/006
+
 ## Run
 
 ```sh