Route relay /new through thread actor

[louis4li]

Issue

Follow-up to #3611 and #3612.

Scope

• Route NyxID relay ingress callbacks to the scoped ChannelConversationThreadGAgent instead of directly to ConversationGAgent.
• Carry a typed conversation_actor_scope_key in NyxRelayInboundActivity so thread forwarding preserves tenant-scoped conversation actor ids.
• Add relay-specific thread actor tests proving /new rotates to #session-00000001 and subsequent relay messages use the active logical conversation.

Verification

• dotnet test test/Aevatar.GAgents.ChannelRuntime.Tests/Aevatar.GAgents.ChannelRuntime.Tests.csproj --nologo --filter "NyxIdRelayIngressPortTests|ChannelConversationThreadGAgentTests|ConversationDispatchMiddlewareTests|ChannelConversationTurnRunnerTests|ConversationGAgentRetainedHistoryClearTests" - 174 passed
• bash tools/ci/test_stability_guards.sh - passed
• bash tools/ci/architecture_guards.sh - passed
• Production endpoint check - requires deployment of this follow-up fix

Notes

• Existing /init/NyxID identity binding remains unchanged; /new only rotates the backend logical conversation mapping.
• Expected post-deploy logs should show conversation=lark:dm:<user>#session-00000001 and target=channel-conversation:lark:dm:<user>#session-00000001:scope:<hash> after /new.

Generated with Claude Code.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-09T15:35:07.370018Z	7e2a485	PR opened

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Reviewed commit: 7e2a485fea

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.47%. Comparing base (6cca55a) to head (fc93c44).
⚠️ Report is 4 commits behind head on feature/integrate.

@@                  Coverage Diff                  @@
##           feature/integrate    #3613      +/-   ##
=====================================================
- Coverage              83.47%   83.47%   -0.01%     
=====================================================
  Files                   1709     1709              
  Lines                 197842   197842              
  Branches               23740    23740              
=====================================================
- Hits                  165145   165142       -3     
- Misses                 21661    21667       +6     
+ Partials               11036    11033       -3     

Flag	Coverage Δ
ci	83.47% <ø> (-0.01%)	⬇️

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