M4: NucleicRemote iPhone app — SwiftUI client over the shared protocol

A real iOS Xcode app (ios/NucleicRemote) linking the NucleicProtocol SwiftPM
library as a local package. Builds for the iOS 27 simulator and launches to the
pairing screen.

- Transport: NWFrameChannel (NWConnection) + LANDiscovery (Bonjour _nucleic._tcp).
- Engine: drives NucleicProtocol.SyncClient (Noise XXpsk0 pair / IK reconnect,
  hello/welcome, HostMsg→Event stream).
- State: RemoteStore (ObservableObject) — the single on-device projection of host
  state; IdentityStore persists the device identity (Keychain) + pinned host.
- UI (UX_IOS): attention-first SessionsView, SessionDetailView (transcript/diff +
  status-driven action area / composer), ApprovalCardView with Face ID gate on
  high-risk approvals + allow-always menu, PairingScannerView (AVFoundation QR),
  SettingsView, connection chip. Same status glyphs/semantics as the Mac.

Add-iPhone QR display + server start live on the macOS side (follow-up); push /
Live Activity are M5 (needs the relay). gitignore keeps this .xcodeproj despite
the blanket *.xcodeproj rule.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

NucleicRemote/NucleicRemote/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,4 @@
+{
+  "images" : [ { "idiom" : "universal", "platform" : "ios", "size" : "1024x1024" } ],
+  "info" : { "author" : "xcode", "version" : 1 }
+}