feat(android): add Compose node app (bridge+canvas+chat+camera)

docs/camera.md

@@ -10,6 +10,7 @@ read_when:
 Clawdis supports **camera capture** for agent workflows:
 
 - **iOS node** (paired via Gateway): capture a **photo** (`jpg`) or **short video clip** (`mp4`, with optional audio) via `node.invoke`.
+- **Android node** (paired via Gateway): capture a **photo** (`jpg`) or **short video clip** (`mp4`, with optional audio) via `node.invoke`.
 - **macOS app** (local control socket): capture a **photo** (`jpg`) or **short video clip** (`mp4`, with optional audio) via `clawdis-mac`.
 
 All camera access is gated behind **user-controlled settings**.
@@ -68,6 +69,26 @@ Notes:
 - `nodes camera snap` defaults to **both** facings to give the agent both views.
 - Output files are temporary (in the OS temp directory) unless you build your own wrapper.
 
+## Android node
+
+### User setting (default on)
+
+- Android Settings sheet → **Camera** → **Allow Camera** (`camera.enabled`)
+  - Default: **on** (missing key is treated as enabled).
+  - When off: `camera.*` commands return `CAMERA_DISABLED`.
+
+### Permissions
+
+- Android requires runtime permissions:
+  - `CAMERA` for both `camera.snap` and `camera.clip`.
+  - `RECORD_AUDIO` for `camera.clip` when `includeAudio=true`.
+
+If permissions are denied, `camera.*` requests fail with a `*_PERMISSION_REQUIRED` error.
+
+### Foreground requirement
+
+Like `screen.*`, the Android node only allows `camera.*` commands in the **foreground**. Background invocations return `NODE_BACKGROUND_UNAVAILABLE`.
+
 ## macOS app
 
 ### User setting (default off)
@@ -95,4 +116,3 @@ clawdis-mac camera clip --no-audio
 
 - Camera and microphone access trigger the usual OS permission prompts (and require usage strings in Info.plist).
 - Video clips are intentionally short to avoid oversized bridge payloads (base64 overhead + WebSocket message limits).
-