Warning: This build has drifted.
The coverage report for this pull request build may be inaccurate because its base commit is no longer the HEAD of its target branch.
This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

    • Learn more: For more information on this, see Tracking coverage changes for pull request builds.
    • Fix now: For a quick fix, rebase this PR at GitHub. Your next report should be accurate.
    • Prevent going forward: To avoid this issue with future PRs, see these Recommended CI Configurations.

Update model compatibility task and fixtures for Anthropic models

- Refactor `Mix.Tasks.ReqLlm.ModelCompat` to improve provider atom conversion logic.
- Update `priv/supported_models.json` with the latest validation timestamp.
- Revise multiple fixture files for Anthropic models, adjusting response times and ensuring consistency across various scenarios.
- Enhance test coverage by updating existing fixtures and adding new ones for Claude and Opus models.