Is Cobb awake at the end of Inception or dreaming?

[JackC]

I just rewatched Inception for probably the tenth time, and I'm still wrestling with the film's ending and what the spinning top truly signifies. Cobb walks away from it to see his children, which feels like a deliberate choice to embrace reality regardless of the outcome, but the ambiguity is masterfully frustrating. For fellow fans who have dug into the theories, what's your definitive read on the final scene? Do you believe the entire film is a metaphor for Cobb's own catharsis and letting go of Mal, and are there any subtle clues in the costume design, set details, or character behaviors in the final act that you think confirm whether he's still dreaming or finally home?