application: channels bounded context

CQRS use cases (create/update/delete/get/list/list_by_owner),
ownership checks, auto-snapshot on config change.
Channel setters added to domain model.

crates/application/src/channels/tests/create.rs

@@ -0,0 +1,65 @@
+use std::sync::Arc;
+
+use domain::testing::{InMemoryChannelRepository, NoopEventPublisher};
+use domain::value_objects::UserId;
+
+use crate::channels::commands::CreateChannelCommand;
+use crate::channels::create;
+use crate::channels::deps::ChannelCommandDeps;
+
+fn make_deps() -> (ChannelCommandDeps, Arc<InMemoryChannelRepository>) {
+    let repo = Arc::new(InMemoryChannelRepository::new());
+    let deps = ChannelCommandDeps {
+        channel_command: repo.clone(),
+        channel_query: repo.clone(),
+        event_publisher: Arc::new(NoopEventPublisher::new()),
+    };
+    (deps, repo)
+}
+
+#[tokio::test]
+async fn creates_channel_successfully() {
+    let (deps, repo) = make_deps();
+    let owner = UserId::generate();
+
+    let channel = create::execute(
+        &deps,
+        CreateChannelCommand {
+            owner_id: owner.value(),
+            name: "Movie Night".into(),
+            timezone: "America/New_York".into(),
+        },
+    )
+    .await
+    .unwrap();
+
+    assert_eq!(channel.name(), "Movie Night");
+    assert_eq!(channel.timezone(), "America/New_York");
+    assert_eq!(channel.owner_id(), owner);
+
+    // Verify persisted
+    let stored = repo.channels.lock().unwrap();
+    assert_eq!(stored.len(), 1);
+    let persisted = stored.values().next().unwrap();
+    assert_eq!(persisted.id(), channel.id());
+}
+
+#[tokio::test]
+async fn create_returns_default_config() {
+    let (deps, _) = make_deps();
+
+    let channel = create::execute(
+        &deps,
+        CreateChannelCommand {
+            owner_id: UserId::generate().value(),
+            name: "Defaults".into(),
+            timezone: "UTC".into(),
+        },
+    )
+    .await
+    .unwrap();
+
+    assert!(channel.description().is_none());
+    assert!(!channel.auto_schedule());
+    assert!(channel.schedule_config().day_blocks().is_empty());
+}