feat: add opencode provider and refactor stream model to head/tail architecture

package-lock.json

@@ -14,8 +14,7 @@
         "packages/app"
       ],
       "dependencies": {
-        "@anthropic-ai/claude-agent-sdk": "^0.1.75",
-        "@openai/codex-sdk": "^0.76.0"
+        "@anthropic-ai/claude-agent-sdk": "^0.1.75"
       },
       "devDependencies": {
         "patch-package": "^8.0.1",
@@ -5762,14 +5761,11 @@
         "node": ">=12.0.0"
       }
     },
-    "node_modules/@openai/codex-sdk": {
-      "version": "0.76.0",
-      "resolved": "https://registry.npmjs.org/@openai/codex-sdk/-/codex-sdk-0.76.0.tgz",
-      "integrity": "sha512-0Z1znTuZ7g4wYrBDzEMWEKjA7y3qUdeS/nCtIiPakzxkrcFCm67W1P+7cDym9jnN2DnFTwLedZ0FRKGzQggQ/w==",
-      "license": "Apache-2.0",
-      "engines": {
-        "node": ">=18"
-      }
+    "node_modules/@opencode-ai/sdk": {
+      "version": "1.1.12",
+      "resolved": "https://registry.npmjs.org/@opencode-ai/sdk/-/sdk-1.1.12.tgz",
+      "integrity": "sha512-M1c+525865g2C03iKaMdx3aUVC7oZSNbBGaTDjUN2UTIakdxqKHog0Hd8IA9WL8M0aU1QJ8+CnpvRT2Jt9kRNw==",
+      "license": "MIT"
     },
     "node_modules/@openrouter/ai-sdk-provider": {
       "version": "1.2.0",
@@ -21337,6 +21333,7 @@
         "@lezer/markdown": "^1.6.2",
         "@lezer/python": "^1.1.18",
         "@modelcontextprotocol/sdk": "^1.20.1",
+        "@opencode-ai/sdk": "^1.1.12",
         "@openrouter/ai-sdk-provider": "^1.2.0",
         "ai": "^5.0.76",
         "dotenv": "^17.2.3",