fix(controller): wrap secret fetch errors with %w to preserve error chain

[mesutoezdil]

ReconcileKagentModelConfig appends secret fetch errors via multierror.Append, but both fmt.Errorf calls used %v instead of %w. This means the original Kubernetes API error is stringified and lost — errors.Is and errors.As cannot unwrap through the multi-error to inspect the root cause (e.g. apierrors.IsNotFound).

Switching to %w keeps the error chain intact so callers can inspect or match the underlying error type.

Two lines changed, no behaviour change in the happy path.

[Copilot]

Pull request overview

This PR preserves Kubernetes API error chains when ReconcileKagentModelConfig aggregates secret-fetch failures, by switching fmt.Errorf formatting from %v to %w so callers can use errors.Is / errors.As on the wrapped errors.

Changes:

• Wrap secret fetch (a.kube.Get) errors with %w when appending into multierror.

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