Generated with CC:
Replace cryptic KeyError with clear, actionable error message that
shows:
- Which API the failing provider belongs to
- The provider ID and type that's failing
- Which dependency is missing
- Clear instructions on how to fix the issue
## Test plan
Use a run config with Agents API and no safety provider
Before: KeyError: <Api.safety: 'safety'>
After: Failed to resolve 'agents' provider 'meta-reference' of type
'inline::meta-reference': required dependency 'safety' is not available.
Please add a 'safety' provider to your configuration or check if the
provider is properly configured.