v0.5.0: Binary-Free Mode - No OpenCode binary required

✨ Major Features:
- Native session management without OpenCode binary
- Provider routing: OpenCode Zen (free), Qwen OAuth, Z.AI
- Streaming chat with tool execution loop
- Mode detection API (/api/meta/mode)
- MCP integration fix (resolved infinite loading)
- NomadArch Native option in UI with comparison info

🆓 Free Models (No API Key):
- GPT-5 Nano (400K context)
- Grok Code Fast 1 (256K context)
- GLM-4.7 (205K context)
- Doubao Seed Code (256K context)
- Big Pickle (200K context)

📦 New Files:
- session-store.ts: Native session persistence
- native-sessions.ts: REST API for sessions
- lite-mode.ts: UI mode detection client
- native-sessions.ts (UI): SolidJS store

🔧 Updated:
- All installers: Optional binary download
- All launchers: Mode detection display
- Binary selector: Added NomadArch Native option
- README: Binary-Free Mode documentation

packages/ui/src/stores/instance-config.tsx

@@ -29,9 +29,14 @@ function cloneInstanceData(data?: InstanceData | null): InstanceData {
   }
 }
 
+// Track instance IDs that we are currently saving - ignore SSE echoes
+const pendingSaveIds = new Set<string>()
+
 function attachSubscription(instanceId: string) {
   if (instanceSubscriptions.has(instanceId)) return
   const unsubscribe = storage.onInstanceDataChanged(instanceId, (data) => {
+    // Skip SSE echo from our own save
+    if (pendingSaveIds.has(instanceId)) return
     setInstanceData(instanceId, data)
   })
   instanceSubscriptions.set(instanceId, unsubscribe)
@@ -83,12 +88,15 @@ async function updateInstanceConfig(instanceId: string, mutator: (draft: Instanc
   const current = instanceDataMap().get(instanceId) ?? DEFAULT_INSTANCE_DATA
   const draft = cloneInstanceData(current)
   mutator(draft)
+  setInstanceData(instanceId, draft)
+  pendingSaveIds.add(instanceId)
   try {
     await storage.saveInstanceData(instanceId, draft)
   } catch (error) {
     log.warn("Failed to persist instance data", error)
+  } finally {
+    setTimeout(() => pendingSaveIds.delete(instanceId), 1000)
   }
-  setInstanceData(instanceId, draft)
 }
 
 function getInstanceConfig(instanceId: string): InstanceData {