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/06-channels-cron-search.md

@@ -23,10 +23,10 @@ gateway identity concepts**.
 ## 6.2 Default chat
 
 - On first connect, the plugin ensures a **default channel** exists:
-  `chat_id = ANDROID_HOME_CHANNEL` (default `default`), `kind=default`,
+  `chat_id = IRIS_HOME_CHANNEL` (default `default`), `kind=default`,
   `is_default=true`, name "Default".
 - It is also the **cron home channel** (`cron_deliver_env_var=
-  ANDROID_HOME_CHANNEL`), so `deliver=android` (bare) routes here.
+  IRIS_HOME_CHANNEL`), so `deliver=iris` (bare) routes here.
 - The app opens the default chat on launch.
 
 ## 6.3 Threads (toggle for overview)