Providers: add Opencode Go support (#42313)

* feat(providers): add opencode-go provider support and onboarding

* Onboard: unify OpenCode auth handling openclaw#42313 thanks @ImLukeF

* Docs: merge OpenCode Zen and Go docs openclaw#42313 thanks @ImLukeF

* Update CHANGELOG.md

---------

Co-authored-by: Ubuntu <ubuntu@vps-90352893.vps.ovh.ca>
Co-authored-by: Vincent Koc <vincentkoc@ieee.org>

docs/providers/opencode.md

@@ -1,25 +1,38 @@
 ---
-summary: "Use OpenCode Zen (curated models) with OpenClaw"
+summary: "Use OpenCode Zen and Go catalogs with OpenClaw"
 read_when:
-  - You want OpenCode Zen for model access
-  - You want a curated list of coding-friendly models
-title: "OpenCode Zen"
+  - You want OpenCode-hosted model access
+  - You want to pick between the Zen and Go catalogs
+title: "OpenCode"
 ---
 
-# OpenCode Zen
+# OpenCode
 
-OpenCode Zen is a **curated list of models** recommended by the OpenCode team for coding agents.
-It is an optional, hosted model access path that uses an API key and the `opencode` provider.
-Zen is currently in beta.
+OpenCode exposes two hosted catalogs in OpenClaw:
+
+- `opencode/...` for the **Zen** catalog
+- `opencode-go/...` for the **Go** catalog
+
+Both catalogs use the same OpenCode API key. OpenClaw keeps the runtime provider ids
+split so upstream per-model routing stays correct, but onboarding and docs treat them
+as one OpenCode setup.
 
 ## CLI setup
 
+### Zen catalog
+
 ```bash
 openclaw onboard --auth-choice opencode-zen
-# or non-interactive
 openclaw onboard --opencode-zen-api-key "$OPENCODE_API_KEY"
 ```
 
+### Go catalog
+
+```bash
+openclaw onboard --auth-choice opencode-go
+openclaw onboard --opencode-go-api-key "$OPENCODE_API_KEY"
+```
+
 ## Config snippet
 
 ```json5
@@ -29,8 +42,23 @@ openclaw onboard --opencode-zen-api-key "$OPENCODE_API_KEY"
 }
 ```
 
+## Catalogs
+
+### Zen
+
+- Runtime provider: `opencode`
+- Example models: `opencode/claude-opus-4-6`, `opencode/gpt-5.2`, `opencode/gemini-3-pro`
+- Best when you want the curated OpenCode multi-model proxy
+
+### Go
+
+- Runtime provider: `opencode-go`
+- Example models: `opencode-go/kimi-k2.5`, `opencode-go/glm-5`, `opencode-go/minimax-m2.5`
+- Best when you want the OpenCode-hosted Kimi/GLM/MiniMax lineup
+
 ## Notes
 
 - `OPENCODE_ZEN_API_KEY` is also supported.
-- You sign in to Zen, add billing details, and copy your API key.
-- OpenCode Zen bills per request; check the OpenCode dashboard for details.
+- Entering one OpenCode key during onboarding stores credentials for both runtime providers.
+- You sign in to OpenCode, add billing details, and copy your API key.
+- Billing and catalog availability are managed from the OpenCode dashboard.