Fix GetCallerBaggagePairs: resolve userId across all channels#251

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fpfp100 wants to merge 3 commits intomainfrom

fix/userid-fallback-chain

Commits on May 5, 2026

Fix GetCallerBaggagePairs: resolve userId across all channels

jsl517
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claude
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Address Copilot review feedback: clean up misleading comments

jsl517
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claude
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Address review: inline fallback, add GUID test to match .NET PR #246

jsl517
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claude
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