docs: add MiniMax provider community offer and setup guide (#219)

Add MiniMax as the first Founding Provider Community Offer Pilot
— a limited-time 12% discount for OMA users valid until 2026-06-30.

- README: new Provider community offers section in Ecosystem
- README_zh: Chinese equivalent (Provider 社区优惠)
- docs/providers/minimax.md: setup guide with offer details,
  model description, configuration examples, and disclosure

README.md

@@ -200,6 +200,12 @@ Using `open-multi-agent` in production or a side project? [Open a discussion](ht
 
 Built an integration? [Open a discussion](https://github.com/open-multi-agent/open-multi-agent/discussions) to get listed.
 
+### Provider community offers
+
+Limited-time provider offers for `open-multi-agent` users. Listings are not paid endorsements.
+
+- **[MiniMax](https://platform.minimax.io/subscribe/coding-plan?code=6ZoOY13DDV&source=link)** — Use MiniMax M2.7 in OMA's TypeScript multi-agent workflows. OMA users get 12% off the MiniMax Token Plan until 2026-06-30. See the [MiniMax setup guide](./docs/providers/minimax.md).
+
 ### Featured partner
 
 For products and platforms with a deep `open-multi-agent` integration. See the [Featured partner program](./docs/featured-partner.md) for terms and how to apply.

README_zh.md

@@ -200,6 +200,12 @@ Shell 和 CI 场景使用 JSON-first 的 `oma` 命令行工具。详见 [docs/cl
 
 做了 `open-multi-agent` 集成？[开个 Discussion](https://github.com/open-multi-agent/open-multi-agent/discussions)，我们会将其列在这里。
 
+### Provider 社区优惠
+
+面向 `open-multi-agent` 用户的限时 provider 优惠。该列表不代表付费背书或唯一官方推荐。
+
+- **[MiniMax](https://platform.minimaxi.com/subscribe/token-plan?code=98qruMqQhL&source=link)** — 在 OMA 的 TypeScript 多智能体工作流中使用 MiniMax M2.7。OMA 用户可在 2026-06-30 前享 MiniMax Token Plan 专属 88 折优惠。见 [MiniMax 接入指南](./docs/providers/minimax.md)。
+
 ### Featured partner
 
 面向已经深度集成 `open-multi-agent` 的产品和平台。条款和申请方式见 [Featured partner 计划](./docs/featured-partner.md)。

docs/providers/minimax.md

@@ -0,0 +1,75 @@
+# MiniMax setup guide
+
+<img src="../../.github/brand/minimax-banner.png" alt="MiniMax" width="600">
+
+MiniMax M2.7 can be used in OMA's TypeScript multi-agent workflows with a simple provider config.
+
+## Community offer
+
+OMA users get **12% off** the MiniMax Token Plan. Valid until **2026-06-30**.
+
+| Region | Link |
+|--------|------|
+| Global | [platform.minimax.io](https://platform.minimax.io/subscribe/coding-plan?code=6ZoOY13DDV&source=link) |
+| China | [platform.minimaxi.com](https://platform.minimaxi.com/subscribe/token-plan?code=98qruMqQhL&source=link) |
+
+This is a limited-time community offer, not a paid endorsement.
+
+## About MiniMax M2.7
+
+MiniMax describes M2.7 as:
+
+> MiniMax M2.7 is MiniMax's first self-evolution model, capable of autonomously building complex Agent Harnesses and completing high-complexity productivity tasks via Agent Teams, advanced Skills, and Tool Search Tool. It excels in software engineering, end-to-end project delivery, and office scenarios, with stable task execution, environment interaction, and identity-preserving capabilities.
+
+MiniMax 对 M2.7 的描述：
+
+> MiniMax M2.7 是 MiniMax 首个深度参与自我迭代的模型，可自主构建复杂 Agent Harness，并基于 Agent Teams、复杂 Skills、Tool Search Tool 等能力完成高复杂度生产力任务；其在软件工程、端到端项目交付及办公场景中表现优异，多项评测接近行业领先水平，同时具备稳定的复杂任务执行、环境交互能力以及良好的情商与身份保持能力。
+
+## Setup
+
+### Environment variables
+
+```bash
+export MINIMAX_API_KEY=your-api-key
+```
+
+The adapter defaults to the global endpoint (`https://api.minimax.io/v1`). China users should override the base URL:
+
+```bash
+export MINIMAX_BASE_URL=https://api.minimaxi.com/v1
+```
+
+### Agent config
+
+```typescript
+const agent: AgentConfig = {
+  name: 'my-agent',
+  provider: 'minimax',
+  model: 'MiniMax-M2.7',
+  systemPrompt: 'You are a helpful assistant.',
+}
+```
+
+Full example:
+
+```typescript
+import { OpenMultiAgent, type AgentConfig } from '@open-multi-agent/core'
+
+const agent: AgentConfig = {
+  name: 'analyst',
+  provider: 'minimax',
+  model: 'MiniMax-M2.7',
+  systemPrompt: 'Analyze data and produce concise reports.',
+  tools: ['bash', 'file_read', 'file_write'],
+}
+
+const orchestrator = new OpenMultiAgent()
+const result = await orchestrator.runAgent(agent, 'Summarize /tmp/report.csv')
+console.log(result.output)
+```
+
+## Disclosure
+
+- This is a limited-time community offer valid through 2026-06-30.
+- Listings are not paid endorsements.
+- Some provider offers may include referral credits that help maintain the project.