[dotnet-port-fixes] Suppress duplicate hosted workflow responses

[Michelle Clayton (michelle-clayton-work)]

Summary

Align workflow/agentworkflow with the .NET hosted-workflow fix from microsoft/agent-framework#7217 (upstream commit bfc73a5b14b40d40a90bf949d601324894d1bc34).

This change:

• synthesizes stable message IDs for contentful hosted-agent streaming updates when the provider does not supply one
• suppresses completed *agent.Response messages that were already surfaced as streamed updates when IncludeOutputsInResponse is enabled
• preserves the hosted response completion event as a raw-only observability update in streaming mode
• adds end-to-end tests covering duplicate suppression with and without provider-supplied message IDs

Ported .NET PRs

• .NET: Fix declarative autosend output agent-framework#7217 - Fix declarative autosend output

Breaking Changes

No.

Tests and Examples

• Added workflow tests for hosted-agent duplicate suppression and completion-event observability
• go test ./workflow/agentworkflow
• go test ./...
• No examples changed

Notes

• Upstream evidence: dotnet/src/Microsoft.Agents.AI.Workflows/WorkflowSession.cs, dotnet/src/Microsoft.Agents.AI.Workflows/Specialized/AIAgentHostExecutor.cs
• The duplicate suppression is intentionally scoped to completed hosted-agent *agent.Response outputs; existing IncludeOutputsInResponse behavior for non-hosted generic workflow message outputs is unchanged
• Commit ported from upstream head e90b6de5a72d922ea3b803cf4f194e2f1bae354b inspected during selection

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Closes #735

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[github-actions]

Parity Review: Approved

This PR ports the hosted-workflow duplicate-suppression fix from upstream .NET PR microsoft/agent-framework#7217, aligning with WorkflowSession.cs and AIAgentHostExecutor.cs in dotnet/src/Microsoft.Agents.AI.Workflows/.

Exported API changes: None. All new symbols (generatedHostedMessageState, stampHostedUpdateMessageID, responseUpdateHasContent, streamedMessageKey, recordStreamedMessageID, messageWasStreamed) are unexported. The signatures of NewAgent and AgentConfig are unchanged.

Behavioral parity: The duplicate-suppression semantics match the upstream .NET fix — suppressing completed *agent.Response messages already surfaced as streamed updates when IncludeOutputsInResponse is enabled. Stable message-ID stamping for provider-ID-less updates mirrors the upstream behavior. No Python equivalent exists for this hosted-workflow pattern.

No cross-repo parity issues found. The public-api-change label is not warranted.

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