Python: fix(github-copilot): forward telemetry config to client

[Ruiming Zhao (uuzzrm)]

Motivation & Context

GitHubCopilotAgent can accept Copilot CLI telemetry configuration, but the setting was not reaching the CopilotClient that starts the CLI process. That made it impossible to enable the CLI's model and tool spans through the agent configuration described in issue #7624.

Description & Review Guide

• Add the SDK's TelemetryConfig to the public GitHub Copilot options.
• Resolve telemetry alongside the other client-level settings and pass it to CopilotClient.
• Keep telemetry out of create_session options, where it is not a valid session argument.
• Add regression coverage for both the client construction path and the session passthrough boundary.

Related Issue

Fixes #7624

Validation

• uv run poe --directory packages/github_copilot test --no-cov — 152 passed, 6 integration tests deselected
• uv run poe --directory packages/github_copilot syntax — passed
• uv run poe --directory packages/github_copilot build — passed
• git diff --check — passed

The repository's current MyPy baseline reports two pre-existing errors on upstream/main in _parse_usage and BlobAttachment. Pyright could not start in this environment because the installed Node binary has a missing Homebrew llhttp library; neither issue is related to this change.

Contribution Checklist

• The code builds clean without any errors or warnings
• All unit tests pass, and I have added new tests where possible
• The PR follows the Contribution Guidelines
• This PR is linked to an issue and there is no other open PR for this issue
• This is not a breaking change.

[Copilot]

Pull request overview

Forwards GitHub Copilot CLI telemetry configuration from agent options to the SDK client.

Changes:

• Adds typed telemetry configuration to public options and client settings.
• Prevents telemetry from leaking into session arguments.
• Adds regression tests for both boundaries.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
_agent.py	Resolves and forwards telemetry to CopilotClient.
test_github_copilot_agent.py	Verifies client forwarding and session exclusion.

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[github-actions]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
packages/github_copilot/agent_framework_github_copilot
_agent.py	438	22	94%	70–71, 113, 122–124, 128, 560, 575–576, 655, 668, 805, 809, 978, 1012–1013, 1052, 1055, 1192, 1274, 1292
TOTAL	45774	4231	90%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
9297	36 💤	0 ❌	0 🔥	2m 35s ⏱️

[Evan Mattson (moonbox3)]

Could we parse and validate this setting before handing it to the SDK, or keep it out of GitHubCopilotSettings? load_settings leaves GITHUB_COPILOT_TELEMETRY and .env values as strings, so a normal JSON value reaches CopilotClient; SDK 1.0.2 then indexes it as telemetry["otlp_endpoint"] during start() and raises TypeError, preventing the agent from starting. An explicit json.loads into a validated TelemetryConfig would preserve the documented environment path.