Load NyxID recommended skill refs

[louis4li]

Issue

Closes #3661

Scope

• Add typed NyxID connected-service recommended skill refs to the inventory contract and parser.
• Expose a Channel-only nyxid_load_recommended_skill reader that revalidates sender inventory, loads exact Ornn refs, and verifies manifest digests.
• Update Channel prompt guidance and focused tests for exact recommended-skill loading.
• Refresh the NyxID assistant conformance Aevatar source pin required by the architecture guard.

Verification

• dotnet build agents/Aevatar.GAgents.NyxidChat/Aevatar.GAgents.NyxidChat.csproj --nologo
• dotnet test test/Aevatar.AI.Tests/Aevatar.AI.Tests.csproj --nologo --filter "NyxIdServiceInstanceClientTests|NyxIdConnectedServiceToolSourceTests"
• dotnet test test/Aevatar.GAgents.ChannelRuntime.Tests/Aevatar.GAgents.ChannelRuntime.Tests.csproj --nologo --filter ChannelNyxIdConnectedServiceInventoryToolSourceTests
• bash tools/ci/test_stability_guards.sh
• bash tools/ci/architecture_guards.sh
• Live NyxID deployment endpoint check: not run locally; requires deployed NyxID inventory exposing non-empty recommended_skill_refs.

Notes

• The loader does not fall back to display names, latest versions, hidden catalog backfill, or raw proxy calls.
• The recommended skill document is loaded as guidance only; service execution still goes through admitted connected-service tools and frozen schemas.

Generated with Claude Code.

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-18T04:48:35.301017Z	a63449f	PR opened

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