docs: add Ollama Cloud provider setup and model selection to opencode guide

[thepagent]

Problem

The current docs/opencode.md covers basic setup but is missing provider setup, model selection, and Ollama Cloud as a worked example.

Proposed Content

Add an "Ollama Cloud Example" section to docs/opencode.md:

---

Deploy OpenAB with OpenCode + Ollama Cloud

1. Install via Helm

helm repo add openab https://openabdev.github.io/openab
helm repo update

helm install openab openab/openab --version 0.7.6 \
  --set agents.kiro.enabled=false \
  --set agents.opencode.enabled=true \
  --set agents.opencode.command=opencode \
  --set 'agents.opencode.args={acp}' \
  --set agents.opencode.image=ghcr.io/openabdev/openab-opencode:0.7.6 \
  --set agents.opencode.discord.botToken="$DISCORD_BOT_TOKEN" \
  --set-string 'agents.opencode.discord.allowedChannels[0]=YOUR_CHANNEL_ID' \
  --set agents.opencode.workingDir=/home/node \
  --set agents.opencode.pool.maxSessions=3

2. Authenticate Ollama Cloud

kubectl exec -it deployment/openab-opencode -- opencode auth login -p "ollama cloud"

3. Set default model

The key is opencode.json in the working directory (/home/node). OpenCode reads it as project-level config:

kubectl exec deployment/openab-opencode -- sh -c \
  'echo "{\"model\": \"ollama-cloud/gemini-3-flash-preview\"}" > /home/node/opencode.json'

This file is on the PVC and persists across restarts.

To list available models:

kubectl exec deployment/openab-opencode -- opencode models

4. Restart to pick up config

kubectl rollout restart deployment/openab-opencode

5. Verify

kubectl logs deployment/openab-opencode --tail=5
# Should show: discord bot connected

@mention the bot in your Discord channel to start chatting.

---

Providers

OpenCode supports multiple providers. You can add any of them via opencode auth login:

• Ollama Cloud — free tier available, models like gemini-3-flash-preview, qwen3-coder-next, deepseek-v3.2
• OpenCode subscription — if you have an OpenCode subscription, you can use OpenCode-provided models like opencode/big-pickle or opencode/gpt-5-nano without additional provider setup

To list all available models across configured providers:

kubectl exec deployment/openab-opencode -- opencode models

Architecture

OpenCode supports 75+ LLM providers via the AI SDK, making it the most flexible backend for OpenAB. Users bring their own provider — no separate API keys per backend needed.

┌──────────┐  Discord   ┌────────┐  ACP stdio  ┌──────────┐     ┌─────────────────────┐
│ Discord  │ ◄────────► │ OpenAB │ ◄─────────► │ OpenCode │ ──► │ LLM Providers       │
│ Users    │  Gateway    │ (Rust) │  JSON-RPC   │ (ACP)    │     │                     │
└──────────┘             └────────┘             └──────────┘     │ ┌─────────────────┐ │
                                                    │            │ │ Ollama Cloud     │ │
                                          opencode.json          │ │ (free tier)      │ │
                                          sets model             │ ├─────────────────┤ │
                                                                 │ │ OpenAI          │ │
                                                                 │ │ (ChatGPT Plus)  │ │
                                                                 │ ├─────────────────┤ │
                                                                 │ │ Anthropic       │ │
                                                                 │ ├─────────────────┤ │
                                                                 │ │ AWS Bedrock     │ │
                                                                 │ ├─────────────────┤ │
                                                                 │ │ GitHub Copilot  │ │
                                                                 │ ├─────────────────┤ │
                                                                 │ │ Groq            │ │
                                                                 │ ├─────────────────┤ │
                                                                 │ │ OpenRouter      │ │
                                                                 │ ├─────────────────┤ │
                                                                 │ │ Ollama (local)  │ │
                                                                 │ ├─────────────────┤ │
                                                                 │ │ 75+ more...     │ │
                                                                 │ └─────────────────┘ │
                                                                 └─────────────────────┘

See the full provider list at https://opencode.ai/docs/providers/

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