chore: remove references to GitHub models

[p-]

GitHub Models were retired on July 30, 2026
https://github.blog/changelog/2026-07-01-github-models-is-being-fully-retired-on-july-30-2026/

[Copilot]

Pull request overview

Removes the now-retired GitHub Models (models.github.ai) provider and its related test coverage, aligning the agent’s endpoint/provider logic and documentation with GitHub Models’ retirement date in the PR description.

Changes:

• Removed the GitHub Models provider implementation and registry entry from capi.py.
• Deleted GitHub Models–specific tests (provider resolution and capability/tool-call detection).
• Updated test/docstrings to reflect GitHub Copilot as the default/known endpoint.

Show a summary per file

File	Description
tests/test_sdk_anthropic_adapter.py	Removes GitHub Models assertion from bearer-auth behavior test and updates wording.
tests/test_capi_extended.py	Removes GitHub Models endpoint/provider tests for tool-call support and provider registry.
tests/test_api_endpoint_config.py	Updates default endpoint expectation and removes GitHub Models base-url assertion.
src/seclab_taskflow_agent/capi.py	Drops GitHub Models provider class/registry entry and updates module docstring accordingly.

Review details

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• Files reviewed: 4/4 changed files
• Comments generated: 1
• Review effort level: Lite

[Copilot]

Review details

Suppressed comments (1)

tests/test_sdk_anthropic_adapter.py:226

• The docstring refers to “CAPI” as a provider, but the provider here is actually GitHub Copilot (api.githubcopilot.com). Using the concrete provider name/endpoint in the docstring will avoid confusion for readers unfamiliar with the module acronym.

def test_known_provider_uses_bearer_auth():
    """Known providers like CAPI should have bearer_auth=True."""
    from seclab_taskflow_agent.capi import get_provider

• Files reviewed: 4/4 changed files
• Comments generated: 0 new
• Review effort level: Lite