docs: document native clients — full iOS/iPad feature README + root Clients section

ios/README: add a comprehensive Features section (P0 pocket cockpit, P1 walk-away
complete, iPad adaptive split, design system, verification status); note min iOS
17, both-idiom test commands, P1 server touch-points.
root README: add a Clients section covering the iOS/iPad app, desktop Electron
shell, and the pre-production relay stack (with Tailscale as the remote-access
path today).

README.md

@@ -49,6 +49,36 @@ Sessions survive disconnects: the shell (and whatever's running in it) keeps goi
 
 ---
 
+## Clients
+
+The browser is the reference client; two native clients and a remote-access
+service are also in the repo (all consume the same wire protocol — the server
+stays a byte-shuttle).
+
+- **iOS / iPad app** ([`ios/`](ios/), branch `feat/ios-client`) — a native
+  SwiftUI + SwiftTerm **pure remote client** built for the walk-away loop:
+  native terminal with scrollback replay, QR/manual pairing (Keychain), the
+  remote **Approve / Reject** gate + three-way plan gate, **APNs push with
+  lock-screen Allow / Deny behind Face ID**, deep links, Projects, multi-session
+  switcher, timeline, diff, quick-reply, and an **adaptive iPhone/iPad split
+  layout**. Looks like the desktop (amber-gold, dark-first). P0 needs zero server
+  changes; P1 adds two declared additive touch-points. See
+  [`ios/README.md`](ios/README.md). *(Not yet merged.)*
+- **Desktop app** ([`desktop/`](desktop/)) — a Mac/Windows **Electron shell that
+  embeds this Node server + node-pty** (all-in-one), for native notifications,
+  tray, deep links and launch-at-login. Design in
+  [`docs/DESKTOP_PLAN.md`](docs/DESKTOP_PLAN.md). *(Built; packaged & launch-
+  verified on Apple Silicon.)*
+- **Rendezvous relay** (`term-relay/` · `agent/` · `relay-e2e/` · `relay-web/` ·
+  `relay-auth/` · `relay-contracts/`) — an "ngrok-for-Claude-Code" with
+  **end-to-end encryption** to reach a self-hosted host from anywhere, without a
+  VPN or port-forwarding. Security-audited but **pre-production / not deployed**;
+  see [`docs/PLAN_RELAY_INDEX.md`](docs/PLAN_RELAY_INDEX.md) and
+  [`docs/DEPLOY_RELAY.md`](docs/DEPLOY_RELAY.md). For remote access **today**, use
+  **Tailscale** (§ Security & deployment below).
+
+---
+
 ## Quick start
 
 ### Prerequisites