diff --git a/ROADMAP.md b/ROADMAP.md
index 652b003..eec25f0 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -63,6 +63,12 @@ This document tracks planned features and their implementation status.
   - Creates contacts marked as `isReceivedCard`
   - "Scan Card" button in Contacts toolbar
 
+- [x] **watchOS companion app** - Show default card QR code on Apple Watch
+  - Full-screen default card display (no card picker)
+  - QR codes pre-generated on iPhone (CoreImage not available on watchOS)
+  - Syncs via WatchConnectivity framework
+  - Automatic sync when cards created, edited, or deleted on iPhone
+
 ---
 
 ## 🔲 Planned Features
@@ -132,11 +138,18 @@ This document tracks planned features and their implementation status.
 
 - [x] **SwiftData persistence** with CloudKit sync
 - [x] **Bedrock integration** - Design system, QR code generator
-- [x] **iOS-Watch sync** via App Groups
+- [x] **iOS-Watch sync** via WatchConnectivity framework
+  - ⚠️ App Groups do NOT work for iPhone ↔ Watch (different devices)
+  - Uses `updateApplicationContext` for persistent sync
+  - Watch app must be embedded in iOS app with "Code Sign On Copy" checked
 - [x] **Unit tests** for models, stores, and new features
 - [x] **Fixed data persistence** - Removed aggressive store deletion on startup
 - [x] **Custom symbol assets** - Brand icons in asset catalog with proper rendering
 - [x] **Drag-and-drop reordering** - Using `draggable` and `dropDestination` modifiers
+- [x] **Single source of truth for names** - Removed legacy `displayName` property
+  - `fullName` computed from individual name fields (prefix, firstName, lastName, etc.)
+  - `vCardName` for plain vCard export
+  - No stored displayName that can get out of sync
 
 ### Planned
 
@@ -144,7 +157,6 @@ This document tracks planned features and their implementation status.
 - [ ] **Spotlight indexing** - Search cards from iOS search
 - [ ] **Siri shortcuts** - "Share my work card"
 - [ ] **App Intents** - iOS 17+ action button support
-- [ ] **Migrate legacy properties** - Move all cards to new ContactField array
 
 ---
 
@@ -153,8 +165,9 @@ This document tracks planned features and their implementation status.
 - Features marked with 🔲 are planned but not yet implemented
 - Features requiring backend are deferred until infrastructure is available
 - Priority may shift based on user feedback
-- Legacy contact properties (email, phone, linkedIn, etc.) maintained for backward compatibility
+- watchOS uses WatchConnectivity (NOT App Groups) - see `Agents.md` for details
+- `fullName` is computed, not stored - never add a `displayName` property
 
 ---
 
-*Last updated: January 9, 2026*
+*Last updated: January 10, 2026*