diff --git a/README.md b/README.md
index 7dfabed..22374d1 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ Shopping cart, checkout, and order management service for the Rose Ash cooperati
 
 ## Architecture
 
-One of four Quart microservices sharing a single PostgreSQL database:
+One of five Quart microservices sharing a single PostgreSQL database:
 
 | App | Port | Domain |
 |-----|------|--------|
@@ -12,6 +12,7 @@ One of four Quart microservices sharing a single PostgreSQL database:
 | market | 8001 | Product browsing, Suma scraping |
 | **cart** | 8002 | Shopping cart, checkout, orders |
 | events | 8003 | Calendars, bookings, tickets |
+| federation | 8004 | ActivityPub, fediverse social |
 
 ## Structure
 
@@ -19,15 +20,12 @@ One of four Quart microservices sharing a single PostgreSQL database:
 app.py                  # Application factory (create_base_app + blueprints)
 path_setup.py           # Adds project root + app dir to sys.path
 config/app-config.yaml  # App URLs, SumUp config
-models/                 # Cart-domain models
-  order.py              #   Order, OrderItem
-  page_config.py        #   PageConfig (per-page SumUp credentials)
+models/                 # Cart-domain models (Order, OrderItem, PageConfig)
 bp/
   cart/                 # Cart blueprint
     global_routes.py    #   Add to cart, checkout, webhooks, return page
     page_routes.py      #   Page-scoped cart and checkout
     overview_routes.py  #   Cart overview / summary page
-    api.py              #   Internal API (/internal/cart/summary)
     services/           #   Business logic
       checkout.py       #     Order creation, SumUp integration
       check_sumup_status.py  #  Payment status polling
@@ -39,31 +37,19 @@ bp/
       clear_cart_for_order.py  # Soft-delete cart after checkout
   order/                # Single order detail view
   orders/               # Order listing view
-templates/              # Jinja2 templates
-entrypoint.sh           # Docker entrypoint
-Dockerfile
-shared/                 # Submodule → git.rose-ash.com/coop/shared.git
-glue/                   # Submodule → git.rose-ash.com/coop/glue.git
+services/               # register_domain_services() — wires cart + calendar + market
+shared/                 # Submodule -> git.rose-ash.com/coop/shared.git
 ```
 
-## Dependencies
+## Cross-Domain Communication
 
-**Cross-app model imports:**
-- `market.models.market.Product, CartItem` — cart services, checkout, API
-- `market.models.market_place.MarketPlace` — checkout page-config resolution, API page filtering
-- `events.models.calendars.CalendarEntry, Calendar` — checkout, API summary, calendar cart services
-- `blog.models.ghost_content.Post` — `app.py` context processor, API page-slug lookup
+- `services.calendar.*` — claim/confirm entries for orders, adopt on login
+- `services.market.*` — marketplace queries for page-scoped carts
+- `services.blog.*` — post lookup for page context
+- `shared.services.navigation` — site navigation tree
 
-**Glue services:**
-- `glue.services.order_lifecycle.claim_entries_for_order` — checkout marks entries as "ordered"
-- `glue.services.order_lifecycle.confirm_entries_for_order` — payment confirmation marks entries "provisional"
-- `glue.services.order_lifecycle.get_entries_for_order` — checkout return page loads entries
-- `glue.services.navigation.get_navigation_tree` — context processor builds site nav
+## Domain Events
 
-**Internal APIs:**
-- Exposes `GET /internal/cart/summary` — cart count + total for current session/user
-
-**Domain events:**
 - `checkout.py` emits `order.created` via `shared.events.emit_event`
 - `check_sumup_status.py` emits `order.paid` via `shared.events.emit_event`
 
@@ -72,11 +58,11 @@ glue/                   # Submodule → git.rose-ash.com/coop/glue.git
 ```
 1. User clicks "Checkout"
 2. create_order_from_cart() creates Order + OrderItems
-3. glue: claim_entries_for_order() marks CalendarEntries as "ordered"
+3. services.calendar.claim_entries_for_order() marks entries as "ordered"
 4. emit: order.created event
 5. SumUp hosted checkout created, user redirected
 6. SumUp webhook / return page triggers check_sumup_status()
-7. If PAID: glue: confirm_entries_for_order(), emit: order.paid
+7. If PAID: services.calendar.confirm_entries_for_order(), emit: order.paid
 ```
 
 ## Running
@@ -86,12 +72,5 @@ export DATABASE_URL_ASYNC=postgresql+asyncpg://user:pass@localhost/coop
 export REDIS_URL=redis://localhost:6379/0
 export SECRET_KEY=your-secret-key
 
-hypercorn app:app --reload --bind 0.0.0.0:8002
-```
-
-## Docker
-
-```bash
-docker build -t cart .
-docker run -p 8002:8000 --env-file .env cart
+hypercorn app:app --bind 0.0.0.0:8002
 ```
diff --git a/app.py b/app.py
index e3e1122..b07534a 100644
--- a/app.py
+++ b/app.py
@@ -1,5 +1,5 @@
 from __future__ import annotations
-import path_setup  # noqa: F401  # adds shared_lib to sys.path
+import path_setup  # noqa: F401  # adds shared/ to sys.path
 
 from decimal import Decimal
 from pathlib import Path
@@ -44,7 +44,7 @@ async def cart_context() -> dict:
     - cart / calendar_cart_entries / total / calendar_total: direct DB
       (cart app owns this data)
     - cart_count: derived from cart + calendar entries (for _mini.html)
-    - menu_items: direct DB query via glue layer
+    - menu_items: via shared.services.navigation
 
     When g.page_post exists, cart and calendar_cart_entries are page-scoped.
     Global cart_count / cart_total stay global for cart-mini.
diff --git a/shared b/shared
index bccfff0..d697709 160000
--- a/shared
+++ b/shared
@@ -1 +1 @@
-Subproject commit bccfff0c699fdf9e3ee7c911af1f17a5294943f6
+Subproject commit d697709f60a71941880f4288be469913d11ce967