feat(3.0.0-rc.4): merge PR #530 — OpenCode Zen and Go providers

Includes all commits from @kang-heewon's PR #530:
- OpencodeExecutor with multi-format routing
- opencode-zen + opencode-go registered in provider registry
- UI metadata added to providers.ts
- Unit tests for OpencodeExecutor (improved to avoid state coupling)

Cherry-picked from add-opencode-providers into 3.0.0-rc.
Conflicts resolved: executors/index.ts (merged pollinations+cloudflare-ai),
providerRegistry.ts (kept testKeyBaseUrl from rc.2 + PR's authType/models).

CHANGELOG.md

@@ -4,6 +4,16 @@
 
 ---
 
+## [3.0.0-rc.4] - 2026-03-22
+
+### ✨ New Features
+
+- **#530 (PR)** — OpenCode Zen and OpenCode Go providers added (by @kang-heewon)
+  - New `OpencodeExecutor` with multi-format routing (`/chat/completions`, `/messages`, `/responses`)
+  - 7 models across both tiers
+
+---
+
 ## [3.0.0-rc.3] - 2026-03-22
 
 ### ✨ New Features

docs/openapi.yaml

@@ -1,7 +1,7 @@
 openapi: 3.1.0
 info:
   title: OmniRoute API
-  version: 3.0.0-rc.3
+  version: 3.0.0-rc.4
   description: |
     OmniRoute is a local-first AI API proxy router. It provides an OpenAI-compatible
     endpoint that routes requests to multiple AI providers with load balancing,

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "omniroute",
-  "version": "3.0.0-rc.3",
+  "version": "3.0.0-rc.4",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "omniroute",
-      "version": "3.0.0-rc.3",
+      "version": "3.0.0-rc.4",
       "hasInstallScript": true,
       "license": "MIT",
       "workspaces": [

package.json

@@ -1,6 +1,6 @@
 {
   "name": "omniroute",
-  "version": "3.0.0-rc.3",
+  "version": "3.0.0-rc.4",
   "description": "Smart AI Router with auto fallback — route to FREE & cheap models, zero downtime. Works with Cursor, Cline, Claude Desktop, Codex, and any OpenAI-compatible tool.",
   "type": "module",
   "bin": {