hermes - 💡(How to fix) Fix model-providers: hermes doctor and setup do not report active plugin overrides [1 pull requests]

Summary

The model-provider plugin system documents that user plugins under $HERMES_HOME/plugins/model-providers/<name>/ override bundled plugins via last-writer-wins, but neither hermes doctor nor the setup wizard reports which profile is actually active or whether an override occurred.

Reproduction

1. Drop a custom model-provider plugin that overrides a built-in (e.g. openrouter or a new xAI profile).
2. Run hermes doctor.
3. No indication of the override appears.

Expected behavior

hermes doctor should list active provider profiles and note when a user plugin has overridden a bundled one.

Actual behavior

Overrides are invisible at runtime and in diagnostics.

Environment

• Hermes Agent (current main)
• macOS / Linux
• Affects users following the documented custom provider workflow

Evidence

• providers/__init__.py implements last-writer-wins.
• hermes_cli/doctor.py calls list_providers() only for API-key health checks and never reports override status.
• Docs in website/docs/developer-guide/model-provider-plugin.md describe the override mechanism but no corresponding diagnostic output exists.
• No prior issue found for this visibility gap.