Add OutputScope for output message tracing with parent span linking

[Copilot]

Extracts output span functionality from PR #113. Adds OutputScope for tracing agent output messages with W3C Trace Context parent span linking.

New files

• spans_scopes/output_scope.py - OpenTelemetry scope for output messages
• models/response.py - Response dataclass

Base scope changes

• Added parent_id parameter to OpenTelemetryScope.__init__
• Parent context parsed from W3C format and passed at span creation (OTel Python has no post-creation parent setter)

Utils refactoring

• parse_parent_id_to_context() moved to utils.py
• Added validate_trace_id(), validate_span_id() with hex validation

Behavior

• record_output_messages() appends to accumulated list (not replace)

response = Response(messages=["Hello"])
parent_id = "00-1234567890abcdef1234567890abcdef-abcdefabcdef1234-01"

with OutputScope.start(agent_details, tenant_details, response, parent_id=parent_id) as scope:
    scope.record_output_messages(["More"])  # Result: ["Hello", "More"]

Tests

Reduced from 10 to 4 focused tests using real spans via InMemorySpanExporter.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• il-1234567812345678123456781234567.8.tenant.api.powerplatform.com
  • Triggering command: /home/REDACTED/work/Agent365-python/Agent365-python/.venv/bin/pytest pytest tests/observability/core/ -v --tb=short -m not integration (dns block)
• il-testtenan.t.tenant.api.powerplatform.com
  • Triggering command: /home/REDACTED/work/Agent365-python/Agent365-python/.venv/bin/pytest pytest tests/observability/core/ -v --tb=short -m not integration (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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