Phase 3 excluded momentum and Fear & Greed from politics/tech/events
markets; Phase 4 fixed ticker detection. But the BTC-dominance signal was
still applied to non-price markets that legitimately mention a ticker
('Will the ETH ETF be approved?'), despite having no demonstrated causality
for non-price outcomes. Reuse the existing is_non_price gate so the
contribution stays 0.0 -> feat_btc_dom_lo = 0.0 for those markets.
Price-market behavior unchanged: ETH/altcoin/general-crypto markets keep
the +/-0.03 dominance adjustment.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
