The default headroom provider (#120): allow any add that still fits under the hard
band-count cap (EQ_MAX_BANDS), refuse beyond it with an honest reason. No
RT/CPU awareness — that is a different provider's job (#121), injected via this same
EqHeadroomProvider seam.
The default headroom provider (#120): allow any add that still fits under the hard band-count cap (EQ_MAX_BANDS), refuse beyond it with an honest reason. No RT/CPU awareness — that is a different provider's job (#121), injected via this same EqHeadroomProvider seam.