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/14-milestones.md

@@ -161,11 +161,11 @@ has explicit **acceptance criteria**. Work top-to-bottom; don't skip M0/M1.
 - [x] `desktopMain`: tray + OS notifications; `MediaPlayer` actual (mpv/WebView);
       `MediaPicker` actual (file dialog); `SecureStore` actual; window mgmt.
 - [x] Two-pane default layout; keyboard shortcuts; optional inspector pane.
-- [ ] Parity pass vs Android feature checklist (`11-desktop-app.md`).
+- [ ] Parity pass vs Iris app feature checklist (`11-desktop-app.md`).
 - [x] jpackage builds (Linux first; macOS/Windows as available).
 - **Demo:** desktop app pairs to the same gateway; full feature parity; tray
   notifications; media plays.
-- **Accept:** all Android features work on desktop; tray + shortcuts work;
+- **Accept:** all Iris app features work on desktop; tray + shortcuts work;
   native binary launches.
 - **Status (complete, 2026-08-19):** All `desktopMain` actuals implemented and
   verified on Linux (X11). `DesktopSecureStore`: non-secrets in
@@ -274,7 +274,7 @@ in-app scanner and `iris://pair` deep link (closes gap #12, `docs/20`).
   build it in M1.
 - **M3 (cron) and M5 (push) both touch the outbox** — build the outbox in M3,
   extend for push in M5.
-- **M6 (desktop) reuses M1–M5 shared code** — do it after the Android features
+- **M6 (desktop) reuses M1–M5 shared code** — do it after the Iris app features
   are stable so the shared module is settled.
 - Parallelizable: plugin (Python) and app (Kotlin) can be worked on
   concurrently once the protocol (`04-wire-protocol.md`) is agreed; the probe