Fix GetCallerBaggagePairs: resolve userId across all channels

[fpfp100]

Summary

• Port of Fix GetCallerBaggagePairs: resolve userId across all channels Agent365-dotnet#246
• userId baggage was only set from aad_object_id, which is None on non-Teams channels and A2A calls
• Added fallback chain: aad_object_id → agentic_user_id → frm.id

Channel behavior after fix

Field	Teams	Other channels (aad_object_id None)	A2A (user)	A2A (agent)
userId	aad_object_id	frm.id	aad_object_id	agentic_user_id

Test plan

• Existing tests pass
• New test: non-Teams channel — userId falls back to frm.id
• New test: A2A — userId falls back to agentic_user_id
• New test: precedence — aad_object_id wins when all set

🤖 Generated with Claude Code

[github-actions]

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Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[Copilot]

Pull request overview

This PR updates observability hosting caller identity extraction so get_caller_pairs can still populate user.id when aad_object_id is absent, improving telemetry coverage for non-Teams and A2A scenarios.

Changes:

• Changed caller ID resolution in get_caller_pairs to use aad_object_id -> agentic_user_id -> from.id.
• Added regression tests for non-Teams fallback to from.id.
• Added tests for A2A fallback and identifier precedence when multiple values are present.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
libraries/microsoft-agents-a365-observability-hosting/microsoft_agents_a365/observability/hosting/scope_helpers/utils.py	Updates caller user.id derivation used by hosting scope helpers.
tests/observability/hosting/scope_helpers/test_scope_helper_utils.py	Adds focused tests for fallback behavior and precedence.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

[fpfp100]

Re: Copilot comment on test_scope_helper_utils.py:106 — The test is correct. In an A2A scenario, agentic_user_id is populated and aad_object_id is null — that is exactly what the test sets up. For human callers on non-Teams channels, agentic_user_id is null, so the fallback skips it and goes to frm.id (covered by test_get_caller_pairs_non_teams_fallback_to_from_id). The presence of agentic_user_id with absent aad_object_id is the A2A condition — no additional marker is needed. This matches the .NET original (microsoft/Agent365-dotnet#246).