Errors

var (
    ErrProviderNotFound    = errors.New("nexus: provider not found")
    ErrModelNotFound       = errors.New("nexus: model not found")
    ErrNoProviderAvailable = errors.New("nexus: no provider available")
    ErrAuthRequired        = errors.New("nexus: authentication required")
    ErrForbidden           = errors.New("nexus: forbidden")
    ErrTenantRequired      = errors.New("nexus: tenant context required")
    ErrTenantNotFound      = errors.New("nexus: tenant not found")
    ErrTenantDisabled      = errors.New("nexus: tenant disabled")
    ErrGuardrailBlocked    = errors.New("nexus: blocked by guardrail")
    ErrCacheMiss           = errors.New("nexus: cache miss")
    ErrRateLimited         = errors.New("nexus: rate limit exceeded")
    ErrBudgetExceeded      = errors.New("nexus: budget exceeded")
    ErrTokenOverflow       = errors.New("nexus: token limit exceeded")
    ErrAliasNotFound       = errors.New("nexus: alias not found")
)