Add QR pairing (terminal QR, in-app scanner, iris://pair deep link)

docs/00-overview.md

@@ -46,7 +46,7 @@ Everything in the feature checklist below.
 | Tool output (app decides how much) | Emits **structured** tool events | App setting: everything / truncated / nothing |
 | Reasoning shown before message | Captures + splits reasoning | Collapsible "Reasoning" block above message |
 | Intermediate messages | Forwards `Commentary` events | Distinct dimmed bubble |
-| Threading + channels; default chat; user channels for cron | `chat_id`/`thread_id` model; cron `deliver=android:<chat>[:<thread>]` | Channel list, thread toggle, "new channel" |
+| Threading + channels; default chat; user channels for cron | `chat_id`/`thread_id` model; cron `deliver=iris:<chat>[:<thread>]` | Channel list, thread toggle, "new channel" |
 | Search ("everywhere" / "this chat/channel") | FTS5 session search bridge | Search UI + scope toggle |
 | Attach media (music/video/images/docs) | Inbound cache; outbound `send_*` | Pickers + chunked upload + preview |
 | Push notifications | FCM (primary) / ntfy (fallback) | FCM token / ntfy topic + notification service |
@@ -57,7 +57,7 @@ Everything in the feature checklist below.
 | Decision | Choice |
 |---|---|
 | Desktop app tech | **Compose Multiplatform** (shares Android code; "tweaked" for big screen) |
-| Push backend | **Both** — FCM primary, ntfy fallback (`ANDROID_PUSH_BACKEND`) |
+| Push backend | **Both** — FCM primary, ntfy fallback (`IRIS_PUSH_BACKEND`) |
 | Media transport | **Over the WebSocket** (chunked binary frames; no extra Python deps) |
 | Phone default layout | **User-toggleable, single-pane default** (auto two-pane on large screens) |
 
@@ -66,7 +66,7 @@ Everything in the feature checklist below.
 1. **`hermes-agent/` is a read-only research reference.** It lives next to this
    folder for study only. It is **git-ignored** and must **never** be committed,
    pushed, or included in any artifact. Our plugin is *installed* into a live
-   hermes home (`~/.hermes/plugins/android`); we never edit hermes core files.
+   hermes home (`~/.hermes/plugins/iris`); we never edit hermes core files.
 2. **ADB is available and a device is connected** (`a5ca2a4b`, Xiaomi MIX 2S,
    Android 10 / API 29). Use `adb install` / `adb logcat` / `adb shell am start`
    to install, launch, and debug the app on-device throughout the build.
@@ -88,6 +88,6 @@ Everything in the feature checklist below.
 ## Naming
 
 - Product/effort name: **Iris × Hermes** (folder `iris_x_hermes`).
-- hermes platform name: **`android`** (the plugin registers `Platform("android")`).
+- hermes platform name: **`iris`** (the plugin registers `Platform("iris")`).
 - WS default port: **8790** (configurable).
-- Default chat id: **`android:default`** (the home channel).
+- Default chat id: **`default`** (the home channel).