fix: detect deployed agent invoke protocol

[Hui Miao (huimiu)]

Why this is needed

Remote azd ai agent invoke previously relied on the local agent definition to choose a protocol. When that definition was stale or missing, a deployed invocations agent could receive a responses payload and fail with an invalid-payload error.

Approach

Remote protocol selection now reads the deployed agent endpoint configuration, filters to invocable protocols, and uses the local definition only when multiple deployed protocols need disambiguation. Explicit protocol and endpoint choices remain authoritative, local invocation behavior is unchanged, and the resolved remote context is reused for the request. Conversation handling was not changed.

Testing

• go test ./... in cli/azd/extensions/azure.ai.agents

Fixes: #7507

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azure.ai.agents PR build

Note

This is an unsigned development build. Install it only if you trust this PR.

Install the extension:

azd ext install "https://azuresdkartifacts.z5.web.core.windows.net/azd/extensions/pr/9808/azure-ai-agents.zip"

• Version: 1.0.0-beta.13.pr.9808.6770521
• Merge commit: 75f0698