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/16-open-questions.md

@@ -4,7 +4,7 @@
 
 | # | Decision | Choice | Rationale |
 | --- | --- | --- | --- |
-| 1 | Desktop app tech | **Compose Multiplatform** | Desktop = "the Android app, tweaked"; share protocol/state/UI. |
+| 1 | Desktop app tech | **Compose Multiplatform** | Desktop = "the Iris app, tweaked"; share protocol/state/UI. |
 | 2 | Push backend | **Both — ntfy default, FCM optional** (issue #10: FCM metadata — title, device token — is routed via Google's servers, contradicting the privacy claim; ntfy keeps it on your own infrastructure) | `IRIS_PUSH_BACKEND`. |
 | 3 | Media transport | **Over the WebSocket** | One transport, zero new Python deps; chunked binary frames. |
 | 4 | Phone default layout | **User-toggleable, single-pane default** | App-like on phones; auto two-pane on large screens; desktop defaults two-pane. |
@@ -44,7 +44,7 @@ will proceed with unless you say otherwise.
    live gateway. If a clean metadata marker exists, prefer it.
 2. **Reasoning prefix format stability (M2).** We split on the `code`-style
    `💭 **Reasoning:**\n```\n…\n```\n\n` prefix. *Default:* set
-   `reasoning_style: code` for android and split on that; fallback = no
+   `reasoning_style: code` for iris and split on that; fallback = no
    reasoning field (full text) if the prefix isn't found. Verify in M2.
 3. **Per-device tokens vs shared token (M1/M5).** *Default (v1):* shared
    `IRIS_TOKEN` + optional `IRIS_ALLOWED_USERS` device allowlist.