Document install verification checklist in careless README

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

careless/README.md

@@ -21,6 +21,40 @@ Loading the module puts the venv's `bin/` on `PATH` (the `careless`
 command is directly available, no activation needed) and sets
 `CARELESS_ENV` to the venv path.
 
+## Verifying the install
+
+Run on a Ra login node after building (in order, cheap to expensive):
+
+```sh
+# 1. module is visible and loads
+module search careless
+module load careless/<version>
+
+# 2. modulefile wiring: PATH + CARELESS_ENV
+which careless          # -> .../careless/<version>/venv/bin/careless
+echo $CARELESS_ENV      # -> .../venv
+
+# 3. venv is self-contained: must resolve inside the module PREFIX,
+#    not the builder's home cache (which may be cleaned later)
+readlink -f "$CARELESS_ENV/bin/python"
+
+# 4. CLI entry point; imports the full TensorFlow stack
+careless --help          # usage text, no traceback
+
+# 5. installed version matches the one requested
+"$CARELESS_ENV/bin/python" -c "import careless; print(careless.__version__)"
+
+# 6. GPU pickup (GPU node only; [] on a CPU node is fine)
+"$CARELESS_ENV/bin/python" -c "import tensorflow as tf; print(tf.config.list_physical_devices('GPU'))"
+```
+
+Optional end-to-end smoke test with a small unmerged mtz (a few seconds;
+proves the TF graph builds and the optimizer steps):
+
+```sh
+careless mono dHKL <file.mtz> /tmp/careless_test --iterations 10
+```
+
 ## Adding a new version
 
 Add the version under `versions:` in `files/config.yaml`, then on a Ra