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/diagrams/architecture.mmd

@@ -6,8 +6,8 @@ flowchart TB
             AGENT["Agent core<br/>(run_agent.py)"]
             SESS["Sessions<br/>(SQLite + FTS5)"]
             CRON["Cron scheduler"]
-            subgraph PLUGIN["android PLATFORM PLUGIN"]
-                ADAPTER["AndroidAdapter<br/>(BasePlatformAdapter)"]
+            subgraph PLUGIN["IRIS PLATFORM PLUGIN"]
+                ADAPTER["IrisAdapter<br/>(BasePlatformAdapter)"]
                 OUTBOX["Outbox (SQLite)<br/>+ sync cursor"]
                 PUSH["push.py<br/>FcmBackend / NtfyBackend"]
                 MEDIA["media.py<br/>cache + chunk stream"]
@@ -33,7 +33,7 @@ flowchart TB
     end
 
     subgraph DEVICES["Clients"]
-        PHONE["ANDROID APP<br/>(Kotlin / Compose)<br/>WS client + ExoPlayer + FCM"]
+        PHONE["IRIS APP (ANDROID)<br/>(Kotlin / Compose)<br/>WS client + ExoPlayer + FCM"]
         DESKTOP["DESKTOP APP<br/>(Compose Multiplatform)<br/>WS client + tray + desktop player"]
     end