refactor: rename features to room-based directory structure

- Rename features/dashboard → features/front_hall
- Update routes: /, /control-room, /parlor, /settings
- Update navigation to 4 rooms (removed chat tab - will be omnipresent dock)
- Add docs/UI_LAYOUT.md with wireframes and responsive specs
- Update ARCHITECTURE.md and PLAN.md to reflect room structure

Directory structure now mirrors "Rooms of the Estate" UI navigation:
- front_hall/ (dashboard)
- control_room/ (infrastructure - containers, stacks, etc.)
- parlor/ (home automation)
- library/ (future)
- study/ (future, hidden)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/ARCHITECTURE.md

@@ -8,6 +8,8 @@ Tatlock UI follows **Clean Architecture** with feature-based organization. This
 
 ## Project Structure
 
+The directory structure mirrors the "Rooms of the Estate" UI navigation (see [UI_LAYOUT.md](./UI_LAYOUT.md)).
+
 ```
 lib/
 ├── main.dart                     # Entry point
@@ -23,13 +25,32 @@ lib/
 ├── shared/                       # Reusable components
 │   ├── components/               # DataGrid, common widgets
 │   └── layouts/                  # App scaffold, navigation
-└── features/                     # Feature modules
-    ├── dashboard/
-    ├── chat/
-    ├── containers/
-    └── housekeeping/
+├── features/                     # Feature modules (rooms)
+│   ├── front_hall/               # Dashboard - estate overview
+│   ├── control_room/             # Infrastructure
+│   │   ├── containers/           # Container management
+│   │   ├── stacks/               # Stack management
+│   │   ├── networks/             # Network management
+│   │   └── volumes/              # Volume management
+│   ├── parlor/                   # Housekeeping - home automation
+│   ├── library/                  # Knowledge management (future)
+│   └── study/                    # Secretarial tasks (future)
+└── chat/                         # Tatlock chat - omnipresent, NOT a room
 ```
 
+### Room-to-Directory Mapping
+
+| UI Room | Directory | Purpose |
+|---------|-----------|---------|
+| Front Hall | `features/front_hall/` | Dashboard, overview, quick access |
+| Control Room | `features/control_room/` | Infrastructure management |
+| Parlor | `features/parlor/` | Home automation |
+| Library | `features/library/` | Knowledge, docs, bookmarks |
+| Study | `features/study/` | Email, calendar (hidden for now) |
+| *(omnipresent)* | `chat/` | Tatlock assistant dock |
+
+Note: `chat/` lives at the top level of `lib/` (not under `features/`) because it's not a navigable room - it's an omnipresent dock injected at the layout level.
+
 ## Feature Structure
 
 Each feature follows a three-layer architecture: