Python: Add OpenTelemetry integration for GitHubCopilotAgent

[droideronline]

Summary

GitHubCopilotAgent currently has no OpenTelemetry instrumentation. This issue tracks adding OTel tracing support following the same pattern used by other agents in the framework (e.g., ClaudeAgent, FoundryAgent).

Proposed Changes

• Split GitHubCopilotAgent into two classes:
  • RawGitHubCopilotAgent - core implementation without telemetry layers
  • GitHubCopilotAgent(AgentTelemetryLayer, RawGitHubCopilotAgent) - OTel-enabled wrapper (recommended for most use cases)
• Add a default_options property to expose the configured model name in span attributes
• Export RawGitHubCopilotAgent from all public namespaces (agent_framework.github, agent_framework_github_copilot)
• Add a new sample github_copilot_with_observability.py showing how to use configure_otel_providers() with GitHubCopilotAgent
• Update the GitHub Copilot samples README with OTel environment variable documentation

Usage After This Change

from agent_framework.github import GitHubCopilotAgent
from agent_framework.observability import configure_otel_providers

# Enable OTel tracing (configure OTEL_EXPORTER_OTLP_ENDPOINT for a collector)
configure_otel_providers()

async with GitHubCopilotAgent(instructions="You are a helpful assistant.") as agent:
    response = await agent.run("Hello!")
    print(response)

Users who want the agent without any telemetry overhead can use RawGitHubCopilotAgent directly.

Related

• Follows the same Raw* / Telemetry-enabled pattern as RawClaudeAgent / ClaudeAgent
• Depends on the SDK 0.2.x migration (tracked separately)