feat(gateway): add MiniMax compatibility

[tomdps]

Main-trunk migration

Replaces #658 after the trunk cutover. The contributor commit now starts from the new main; original authorship is preserved. The only migration resolution retained both the current reasoning-effort tests and the contributor’s new gateway tests.

Original PR body

Reason: add target provider/model to existing provider registry

Summary

Adds MiniMax model compatibility to the bundled gateway configuration.

Related Issues

None.

Changes Made

• Register MiniMax-M3 and MiniMax-M2.7 in the gateway model catalog.
• Support selectable compatibility protocols and token limits in gateway requests.
• Document global and China endpoint configurations and cover request and configuration behavior with tests.

Testing

• npm ci
• npm run check:agent-cli-provider:ci
• npm run check
• npm test

Checklist

• Tests pass (npm test)
• Documentation updated (if needed)
• Follows commit guidelines

[greptile-apps]

Greptile Summary

Adds MiniMax support to the bundled gateway provider.

• Adds selectable OpenAI- and Anthropic-compatible request protocols with configurable token limits.
• Preserves Anthropic response content and groups parallel tool results into a single follow-up user message.
• Registers MiniMax-M3 and MiniMax-M2.7, documents regional endpoints, and adds configuration and request coverage.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains; the previously reported parallel tool-result serialization issue is fixed by grouping consecutive results into one Anthropic user message and is covered by the gateway runner test.

Important Files Changed

Filename	Overview
src/agent-cli-provider/gateway-client.ts	Dispatches requests by protocol, translates Anthropic messages and tools, preserves response blocks, and groups parallel tool results correctly.
src/agent-cli-provider/gateway-runner.ts	Propagates protocol and token-limit settings while retaining Anthropic assistant content across tool turns.
src/agent-cli-provider/gateway-tools.ts	Normalizes and validates gateway protocol and positive token-limit configuration.
src/agent-cli-provider/adapters/gateway.ts	Registers MiniMax models and forwards the new gateway configuration fields.
tests/agent-cli-provider/gateway-runner.test.js	Covers OpenAI token limits and Anthropic endpoint, content-preservation, and parallel-tool-result behavior.
docs/providers.md	Documents protocol selection, token requirements, and MiniMax regional endpoint configurations.

Sequence Diagram

sequenceDiagram
    participant Runner as Gateway Runner
    participant Client as Gateway Client
    participant API as Compatible Endpoint
    Runner->>Client: Request with protocol and messages
    alt OpenAI protocol
        Client->>API: POST /chat/completions
    else Anthropic protocol
        Client->>API: POST /v1/messages
        API-->>Client: Assistant content with parallel tool_use blocks
        Client-->>Runner: Tool calls and original content
        Runner->>Runner: Execute requested tools
        Runner->>Client: Consecutive tool-result messages
        Client->>Client: Group results into one user message
        Client->>API: Follow-up Messages API request
    end
    API-->>Runner: Final response

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_{Reviews (3): Last reviewed commit: "fix(gateway): preserve compatible reques..." | Re-trigger Greptile}

[github-actions]

🎉 This PR is included in version 6.9.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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