asked the clanker to change the arcidecture a bit

crates/services/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "services"
+version.workspace = true
+edition.workspace = true
+
+[lib]
+name = "services"
+path = "src/lib.rs"
+
+[dependencies]
+common = { path = "../common" }
+service_datetime = { package = "service-datetime", path = "datetime" }
+iced = { workspace = true }

crates/services/datetime/Cargo.toml

@@ -1,10 +1,10 @@
 [package]
-name = "service-datatime"
+name = "service-datetime"
 version.workspace = true
 edition.workspace = true
 
 [lib]
-name = "service_datatime"
+name = "service_datetime"
 path = "src/lib.rs"
 
 [dependencies]

crates/services/src/lib.rs

@@ -0,0 +1,14 @@
+//! Service registry: turns a route key into the subscription that backs it.
+//! Adding a service is a new crate under `crates/services/` plus one arm in
+//! `subscription` — core never changes.
+
+use iced::Subscription;
+
+use common::{Service, ServicePayloadKind};
+
+/// The subscription backing a route key.
+pub fn subscription(service: &Service) -> Subscription<ServicePayloadKind> {
+    match service {
+        Service::Clock(_) => service_datetime::ClockTicker::run(),
+    }
+}