feat: Agent Orchestrator — multi-project agent dashboard

Tauri + Svelte 5 + Rust application for orchestrating multiple AI coding agents.
Includes Claude, Aider, Codex, and Ollama provider support, multi-agent
communication (btmsg/bttask), session anchors, plugin sandbox, FTS5 search,
Landlock sandboxing, and 507 vitest + 110 cargo tests.

src-tauri/src/event_sink.rs

@@ -0,0 +1,11 @@
+use bterminal_core::event::EventSink;
+use tauri::{AppHandle, Emitter};
+
+/// Bridges bterminal-core's EventSink trait to Tauri's event system.
+pub struct TauriEventSink(pub AppHandle);
+
+impl EventSink for TauriEventSink {
+    fn emit(&self, event: &str, payload: serde_json::Value) {
+        let _ = self.0.emit(event, &payload);
+    }
+}