split EventBus into DaemonBus + MessageBus

DaemonBus (was EventBus): typed events for system/IPC layer.
MessageBus: channel-based pub/sub for UI/extension coordination.
Messages carry publisher (auto-stamped from extension ID),
channel (required), timestamp, and payload. Subscribe by
publisher, channel, or both — zero collision across extensions.

Extension context gains publish() and subscribe() convenience
methods that auto-stamp the extension's ID as publisher.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/kernel/kernel.dart

@@ -12,6 +12,7 @@
 library;
 
 export 'src/events/bus.dart';
+export 'src/events/message_bus.dart';
 export 'src/events/types.dart';
 export 'src/ipc/client.dart';
 export 'src/log.dart';

lib/kernel/src/events/bus.dart

@@ -2,8 +2,8 @@ import 'dart:async';
 
 import 'package:clide/kernel/src/events/types.dart';
 
-class EventBus {
-  EventBus();
+class DaemonBus {
+  DaemonBus();
 
   final StreamController<ClideEventEnvelope> _controller =
       StreamController<ClideEventEnvelope>.broadcast();

lib/kernel/src/events/message_bus.dart

@@ -0,0 +1,36 @@
+import 'dart:async';
+
+class Message {
+  Message({
+    required this.publisher,
+    required this.channel,
+    required this.data,
+  }) : timestamp = DateTime.now();
+
+  final String publisher;
+  final String channel;
+  final DateTime timestamp;
+  final Map<String, Object?> data;
+
+  String get address => '$publisher/$channel';
+}
+
+class MessageBus {
+  final _controller = StreamController<Message>.broadcast();
+
+  void publish(String publisher, String channel, Map<String, Object?> data) {
+    _controller.add(Message(publisher: publisher, channel: channel, data: data));
+  }
+
+  Stream<Message> subscribe({String? publisher, String? channel}) {
+    return _controller.stream.where((m) {
+      if (publisher != null && m.publisher != publisher) return false;
+      if (channel != null && m.channel != channel) return false;
+      return true;
+    });
+  }
+
+  void dispose() {
+    _controller.close();
+  }
+}

lib/kernel/src/extensions_manager.dart

@@ -8,6 +8,7 @@ import 'package:clide/kernel/src/commands/palette.dart';
 import 'package:clide/kernel/src/commands/registry.dart';
 import 'package:clide/kernel/src/dialog.dart';
 import 'package:clide/kernel/src/events/bus.dart';
+import 'package:clide/kernel/src/events/message_bus.dart';
 import 'package:clide/kernel/src/events/types.dart';
 import 'package:clide/kernel/src/files.dart';
 import 'package:clide/kernel/src/focus.dart';
@@ -30,6 +31,7 @@ class ExtensionManager extends ChangeNotifier {
   ExtensionManager({
     required this.log,
     required this.events,
+    required this.messages,
     required this.settings,
     required this.theme,
     required this.i18n,
@@ -52,7 +54,8 @@ class ExtensionManager extends ChangeNotifier {
   });
 
   final Logger log;
-  final EventBus events;
+  final DaemonBus events;
+  final MessageBus messages;
   final SettingsStore settings;
   final ThemeController theme;
   final I18n i18n;
@@ -239,7 +242,9 @@ class _ExtensionContext implements ClideExtensionContext {
   @override
   Logger get log => manager.log;
   @override
-  EventBus get events => manager.events;
+  DaemonBus get events => manager.events;
+  @override
+  MessageBus get messages => manager.messages;
   @override
   SettingsStore get settings => manager.settings;
   @override

lib/kernel/src/facade.dart

@@ -8,6 +8,7 @@ import 'package:clide/kernel/src/commands/palette.dart';
 import 'package:clide/kernel/src/commands/registry.dart';
 import 'package:clide/kernel/src/dialog.dart';
 import 'package:clide/kernel/src/events/bus.dart';
+import 'package:clide/kernel/src/events/message_bus.dart';
 import 'package:clide/kernel/src/extensions_manager.dart';
 import 'package:clide/kernel/src/files.dart';
 import 'package:clide/kernel/src/focus.dart';
@@ -38,6 +39,7 @@ class KernelServices {
     required this.log,
     required this.settings,
     required this.events,
+    required this.messages,
     required this.ipc,
     required this.theme,
     required this.i18n,
@@ -63,7 +65,8 @@ class KernelServices {
 
   final Logger log;
   final SettingsStore settings;
-  final EventBus events;
+  final DaemonBus events;
+  final MessageBus messages;
   final DaemonClient ipc;
   final ThemeController theme;
   final I18n i18n;
@@ -95,11 +98,12 @@ class KernelServices {
     Locale? initialLocale,
     List<Locale> availableLocales = const [Locale('en', 'US')],
     String? socketPath,
-    DaemonClient Function(Logger, EventBus)? daemonClientFactory,
+    DaemonClient Function(Logger, DaemonBus)? daemonClientFactory,
     bool autoStartDaemonClient = true,
   }) async {
     final log = Logger();
-    final events = EventBus();
+    final events = DaemonBus();
+    final messages = MessageBus();
 
     final settings = SettingsStore(appDir: appDir);
     await settings.load();
@@ -147,6 +151,7 @@ class KernelServices {
     final extensions = ExtensionManager(
       log: log,
       events: events,
+      messages: messages,
       settings: settings,
       theme: theme,
       i18n: i18n,
@@ -176,6 +181,7 @@ class KernelServices {
       log: log,
       settings: settings,
       events: events,
+      messages: messages,
       ipc: ipc,
       theme: theme,
       i18n: i18n,
@@ -218,6 +224,7 @@ class KernelServices {
     project.dispose();
     extensions.dispose();
     await log.dispose();
+    messages.dispose();
     await events.dispose();
   }
 }

lib/kernel/src/files.dart

@@ -31,7 +31,7 @@ class FilesDropped extends ClideEvent {
 /// the service surface real.
 class FileServices {
   FileServices(this._events);
-  final EventBus _events;
+  final DaemonBus _events;
 
   Future<List<String>> pickOpen({
     List<String> extensions = const [],

lib/kernel/src/ipc/client.dart

@@ -13,13 +13,13 @@ class DaemonClient extends ChangeNotifier {
   DaemonClient({
     required this.socketPath,
     required Logger log,
-    required EventBus events,
+    required DaemonBus events,
   })  : _log = log,
         _events = events;
 
   final String socketPath;
   final Logger _log;
-  final EventBus _events;
+  final DaemonBus _events;
 
   Socket? _socket;
   bool _connected = false;

lib/kernel/src/ipc/in_process.dart

@@ -7,7 +7,7 @@ import 'package:clide/src/daemon/dispatcher.dart';
 class InProcessClient extends DaemonClient {
   InProcessClient({
     required Logger log,
-    required EventBus events,
+    required DaemonBus events,
     required this.dispatcher,
   }) : super(socketPath: '', log: log, events: events);
 

lib/kernel/src/os.dart

@@ -16,12 +16,12 @@ class OsLifecycleEvent extends ClideEvent {
 }
 
 class OsBridge {
-  OsBridge({required Logger log, required EventBus events})
+  OsBridge({required Logger log, required DaemonBus events})
       : _log = log,
         _events = events;
 
   final Logger _log;
-  final EventBus _events;
+  final DaemonBus _events;
 
   Future<bool> openURL(String url) async {
     final cmd = _openCommand();

lib/kernel/src/project.dart

@@ -45,14 +45,14 @@ class RecentProject {
 class ProjectManager extends ChangeNotifier {
   ProjectManager({
     required Logger log,
-    required EventBus events,
+    required DaemonBus events,
     required SettingsStore settings,
   })  : _log = log,
         _events = events,
         _settings = settings;
 
   final Logger _log;
-  final EventBus _events;
+  final DaemonBus _events;
   final SettingsStore _settings;
 
   Directory? _current;