v2.2.0-beta.3

What's Changed

• feat(mcp): add Streamable-HTTP dual-protocol client with legacy fallback by @yuanxs21 in #7330
• fix(mcp): abort hung session RPCs on teardown and recover stale list_tools by @yuanxs21 in #7329
• fix(dingtalk): detect stale stream connections and bound SDK requests by @hongxicheng in #7381
• fix(providers): migrate discovered model output limits by @zhijianma in #7386
• fix(providers): restore reliable model discovery for custom OpenAI-compatible providers by @wangfei010313 in #7320
• chore: bump the version to v2.2.0b3 by @cuiyuebing in #7393

Full Changelog: v2.2.0-beta.2...v2.2.0-beta.3