docs: replace stale 'android' name mentions with 'iris'

The plugin is named 'iris' (IrisAdapter, IRIS_HOME_CHANNEL, label Iris),
but several docs still referred to it as the android platform/plugin and
to the product as 'the Android app'. Rename name-mentions to iris/IRIS
and product-mentions to 'Iris app'; keep legitimate OS references
(androidApp, Android SDK, Android 10, androidx, test_android.py, ...).

Also includes pi-lens markdown-lint autofixes (table spacing, trailing
newlines) in the touched files.

docs/12-toolchain.md

@@ -132,7 +132,7 @@ display:
 
 ```bash
 # 1. gateway up with plugin
-hermes gateway status | grep -i android
+hermes gateway status | grep -i iris
 
 # 2. a raw WS client can pair + echo
 python - <<'PY'