diff --git a/CHANGELOG.md b/CHANGELOG.md
index 27cb428..60cb5de 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,28 @@
 All notable changes to VoxClaw are documented here. Earlier releases are on the
 [GitHub releases page](https://github.com/malpern/VoxClaw/releases).
 
+## Unreleased
+
+### Added
+- **Cross-device iCloud relay** — your Mac can speak agent output on your
+  iPhone/iPad even when it's locked, backgrounded, or off your LAN. The Mac
+  writes the request to your **private** CloudKit database
+  (`iCloud.com.malpern.voxclaw`), which silent-pushes and wakes the device to
+  read it aloud. Opt-in on both ends ("Relay to my devices over iCloud" on the
+  Mac, "Remote Relay" on iOS); both must be on the same iCloud account.
+- **iOS app additions** — a Control Center control and home-screen widget
+  ("Read Clipboard"), a "Read Text Aloud" Siri/Spotlight/Shortcuts action, and
+  a "Now reading" Live Activity (lock screen + Dynamic Island). The app ships to
+  internal testers via TestFlight.
+
+### Fixed
+- **Relay voice fidelity** — relayed speech now reproduces the sender's engine,
+  voice, **rate, and prosody** instead of falling back to the receiving device's
+  defaults.
+- **Relay dedup** — the receiver advances its watermark to the newest record it
+  actually fetched (sender clock) rather than its own wall clock, so messages
+  are no longer skipped or duplicated under clock skew.
+
 ## v1.4.1
 
 ### Added
diff --git a/README.md b/README.md
index 4978b76..5e99b69 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@
 
 Run VoxClaw on your Mac and hear OpenClaw speak to you. When OpenClaw runs on another computer — a server, a headless box, or a different machine — send text to your Mac over the network and VoxClaw speaks it aloud with high-quality text-to-speech. Apple's built-in voices work out of the box; add your own OpenAI or ElevenLabs API key for neural voices when you want that extra polish. Paste text, pipe from the CLI, or stream from any device on your LAN — and listen.
 
-VoxClaw also includes an iPhone app in this repo (`VoxClawIOS/`) with the same core listener + teleprompter flow for iOS.
+VoxClaw also includes an iPhone app in this repo (`VoxClawIOS/`) with the same core listener + teleprompter flow for iOS. With **iCloud relay** turned on, your Mac can even speak through your iPhone when it's locked, backgrounded, or on a different network — VoxClaw wakes it with a silent CloudKit push and reads the text aloud, with a "Now reading" Live Activity on the lock screen. The iOS app also adds a Control Center control, a home-screen widget, and a "Read Text Aloud" Siri/Shortcuts action.
 
 For Codex plugin installation and marketplace distribution, use the separate [malpern/codex-marketplace](https://github.com/malpern/codex-marketplace) repository. This repository is the main product repo for the app, website assets, releases, and source code.
 
@@ -47,10 +47,12 @@ A macOS menu bar app + CLI tool that reads text aloud using Apple TTS (default),
 - **Three Voice Engines** — Apple (no setup), OpenAI (BYOK), or ElevenLabs (BYOK), with Apple fallback when cloud auth fails
 - **Automatic Updates** — In-app updates via Sparkle (notarized + EdDSA-signed); a "Check for Updates…" menu item too
 - **Multiple Input Methods** — Arguments, stdin pipe, file, clipboard, URL scheme, and LAN HTTP
-- **Network API for Agents** — `POST /read`, `GET /status`, and `GET /claw`, with request validation and structured status payloads
+- **Network API for Agents** — `POST /read`, `POST /agent-notify`, `POST /ack`, `GET /status`, and `GET /claw`, with request validation and structured status payloads
+- **Multi-Agent Aware** — `project_id` + `agent_id` give each concurrent agent its own voice, and scope "stop reading" (`/ack`) so prompting one agent never cuts off another
+- **Cross-Device iCloud Relay** — Speak agent output on your iPhone/iPad even when it's locked, backgrounded, or off your LAN, via a silent CloudKit push that wakes the device (opt-in, same iCloud account on both ends)
 - **Bonjour Discovery** — Advertises `_voxclaw._tcp` on LAN for peer/device discovery
 - **Menu Bar App + CLI** — Lightweight menu bar controls plus full terminal control via `voxclaw`
-- **iPhone Companion App** — iOS app target included in this repo (`VoxClawIOS/`) using the shared core engine/settings stack
+- **iPhone Companion App** — iOS app (`VoxClawIOS/`) on the shared core engine/settings stack, adding a Control Center control, a home-screen widget, a "Read Text Aloud" Siri/Shortcuts action, a "Now reading" Live Activity, and the iCloud relay receiver
 - **macOS Services Integration** — Read selected text from other apps via Services
 - **Keyboard Controls While Reading** — Space (pause/resume), Escape (stop), Arrow keys (skip ±3s)
 
@@ -84,9 +86,23 @@ swift build -c release
 
 ### iPhone App (iOS)
 
-The repo includes an iPhone app target.
+The repo includes an iPhone app target with a widget extension. Open
+`VoxClawIOS/VoxClawIOS.xcodeproj` in Xcode (26+) and run the `VoxClawIOS` scheme
+on iOS 26+. The app ships to internal testers via TestFlight (see
+`.github/workflows/ios-release.yml`, triggered by `ios-v*` tags).
 
-Open `/Users/malpern/local-code/VoxClaw/VoxClawIOS/VoxClawIOS.xcodeproj` in Xcode and run the `VoxClawIOS` scheme on iOS 26+.
+It adds, on top of the shared listener + teleprompter:
+
+- **Control Center control** + **home-screen widget** — "Read Clipboard" with one tap
+- **Siri / Spotlight / Shortcuts** — "Read Text Aloud"
+- **Live Activity** — a "Now reading" card on the lock screen / Dynamic Island
+- **iCloud relay receiver** — enable "Remote Relay" in iOS Settings (and "Relay
+  to my devices over iCloud" on the Mac) so your Mac's agent speech plays here
+  even when the app is closed or the phone is locked. Both devices must be
+  signed into the same iCloud account with the toggle on.
+
+The relay uses the user's **private** CloudKit database
+(`iCloud.com.malpern.voxclaw`); speech text never leaves your iCloud account.
 
 ## Usage
 
@@ -141,6 +157,12 @@ curl -X POST http://your-mac-ip:4140/read \
   -H 'Content-Type: application/json' \
   -d '{"text": "Hello", "project_id": "/path/to/repo", "agent_id": "session-123"}'
 
+# Ack: stop reading just this agent's current response (scoped by project_id +
+# agent_id), e.g. when the user sends the agent a new prompt. Other agents keep speaking.
+curl -X POST http://your-mac-ip:4140/ack \
+  -H 'Content-Type: application/json' \
+  -d '{"project_id": "/path/to/repo", "agent_id": "session-123"}'
+
 # Plain text body
 curl -X POST http://your-mac-ip:4140/read -d 'Hello from my phone'
 
@@ -234,7 +256,7 @@ Input (args/stdin/file/clipboard/url/network)
 ```
 
 **Tech Stack:**
-- Swift 6.2 with strict concurrency
+- Swift 6.4 with strict concurrency
 - SwiftUI + NSPanel for floating overlay
 - AVAudioEngine for low-latency audio playback
 - Apple AVSpeechSynthesizer + OpenAI TTS API (`gpt-4o-mini-tts`) + ElevenLabs TTS API
@@ -242,6 +264,8 @@ Input (args/stdin/file/clipboard/url/network)
 - Swift Argument Parser for CLI
 - NWListener (Network.framework) for LAN text input
 - Bonjour service advertisement (`_voxclaw._tcp`) for discovery
+- CloudKit (private database, silent-push `CKDatabaseSubscription`) for the cross-device iCloud relay
+- WidgetKit + App Intents + ActivityKit on iOS (Control Center control, widget, Siri/Shortcuts, Live Activity)
 - Keychain Services for secure API key storage
 - Sparkle for notarized, EdDSA-signed in-app auto-updates
 
diff --git a/SKILL.md b/SKILL.md
index d0f989a..33cd580 100644
--- a/SKILL.md
+++ b/SKILL.md
@@ -71,6 +71,26 @@ curl -X POST http://<mac-ip>:4140/read -d 'Hello from your agent!'
 {"status": "reading"}
 ```
 
+### Stop Reading (Ack)
+
+Stop reading the response you previously sent — scoped to a single agent by
+`project_id` + `agent_id`, so other agents keep speaking. Useful when the user
+sends your agent a new prompt and the old spoken response is now stale.
+
+```bash
+curl -X POST http://<mac-ip>:4140/ack \
+  -H 'Content-Type: application/json' \
+  -d '{"project_id": "/path/to/repo", "agent_id": "session-123"}'
+```
+
+| Field        | Type   | Required | Description |
+|--------------|--------|----------|-------------|
+| `project_id` | string | **yes**  | Same identifier you passed to `/read` (a request without it returns 400) |
+| `agent_id`   | string | no       | Same identifier you passed to `/read`; scopes the stop to this one agent. Omit it to stop everything for the project |
+
+The ack stops local playback and is relayed to your LAN peer speakers so it
+stops there too. Response: `{"status":"acknowledged"}`.
+
 ### Agent Notifications
 
 Use agent notifications for task summaries, failures, and optional live progress updates.
@@ -161,7 +181,7 @@ VoxClaw advertises itself via Bonjour as `_voxclaw._tcp` on the local network. A
 | 200    | Text accepted, now reading                 |
 | 200    | Agent notification accepted or suppressed  |
 | 400    | Missing or empty text, or text too long    |
-| 404    | Unknown endpoint (use `POST /read`, `POST /agent-notify`, or `GET /status`) |
+| 404    | Unknown endpoint (use `POST /read`, `POST /agent-notify`, `POST /ack`, or `GET /status`) |
 | 413    | Request body too large (max 1 MB)          |
 
 Error responses are JSON: `{"error": "description"}`.