add all crates: domain, protocol, application, client, adapters, ESP32 firmware

Server: domain (entities, value objects, ports), protocol (postcard wire types),
application (config service, data projection), adapters (config-memory, tcp-server),
bootstrap (composition root with fake data).

Client: client-domain (layout engine, render tree, HAL ports),
client-application (message handling, repaint commands),
adapters (tcp-client, display-terminal), client-desktop (end-to-end working).

ESP32: client-esp32 firmware with ILI9341 display over SPI, WiFi networking.
Display test verified on hardware — landscape orientation, text rendering works.

60 workspace tests, all passing.

crates/domain/src/ports/broadcast.rs

@@ -0,0 +1,17 @@
+use crate::entities::WidgetId;
+use crate::value_objects::{Layout, WidgetState};
+
+pub trait BroadcastPort {
+    type Error;
+
+    async fn push_screen_update(
+        &self,
+        layout: &Layout,
+        widgets: &[(WidgetId, WidgetState)],
+    ) -> Result<(), Self::Error>;
+
+    async fn push_data_update(
+        &self,
+        updates: &[(WidgetId, WidgetState)],
+    ) -> Result<(), Self::Error>;
+}

crates/domain/src/ports/config_repository.rs

@@ -0,0 +1,26 @@
+use crate::entities::{
+    DataSource, DataSourceId, LayoutPreset, LayoutPresetId, WidgetConfig, WidgetId,
+};
+use crate::value_objects::Layout;
+
+pub trait ConfigRepository {
+    type Error;
+
+    async fn get_widget(&self, id: WidgetId) -> Result<Option<WidgetConfig>, Self::Error>;
+    async fn list_widgets(&self) -> Result<Vec<WidgetConfig>, Self::Error>;
+    async fn save_widget(&self, config: &WidgetConfig) -> Result<(), Self::Error>;
+    async fn delete_widget(&self, id: WidgetId) -> Result<(), Self::Error>;
+
+    async fn get_data_source(&self, id: DataSourceId) -> Result<Option<DataSource>, Self::Error>;
+    async fn list_data_sources(&self) -> Result<Vec<DataSource>, Self::Error>;
+    async fn save_data_source(&self, source: &DataSource) -> Result<(), Self::Error>;
+    async fn delete_data_source(&self, id: DataSourceId) -> Result<(), Self::Error>;
+
+    async fn get_layout(&self) -> Result<Option<Layout>, Self::Error>;
+    async fn save_layout(&self, layout: &Layout) -> Result<(), Self::Error>;
+
+    async fn get_preset(&self, id: LayoutPresetId) -> Result<Option<LayoutPreset>, Self::Error>;
+    async fn list_presets(&self) -> Result<Vec<LayoutPreset>, Self::Error>;
+    async fn save_preset(&self, preset: &LayoutPreset) -> Result<(), Self::Error>;
+    async fn delete_preset(&self, id: LayoutPresetId) -> Result<(), Self::Error>;
+}

crates/domain/src/ports/data_source_port.rs

@@ -0,0 +1,8 @@
+use crate::entities::DataSource;
+use crate::value_objects::Value;
+
+pub trait DataSourcePort {
+    type Error;
+
+    async fn poll(&self, source: &DataSource) -> Result<Value, Self::Error>;
+}

crates/domain/src/ports/event.rs

@@ -0,0 +1,7 @@
+use crate::events::DomainEvent;
+
+pub trait EventPublisher {
+    type Error;
+
+    async fn publish(&self, event: DomainEvent) -> Result<(), Self::Error>;
+}

crates/domain/src/ports/mod.rs

@@ -0,0 +1,9 @@
+mod config_repository;
+mod data_source_port;
+mod broadcast;
+mod event;
+
+pub use config_repository::ConfigRepository;
+pub use data_source_port::DataSourcePort;
+pub use broadcast::BroadcastPort;
+pub use event::EventPublisher;