gen-cards: regenerate Use-it block

README: add gen-cards use-it markers

Gemma4-VL: vision bundles + card section

card: official-QAT int4 row + section

card: iPhone-ready AOT h18p tbl bundle + CoreAIChat Gemma ⚡ mode (chat-surface 32.7/44.2)

card: GPU-pipelined fast path section (tbl bundle, run contract, AOT + buffer rules)

gemma4 iPhone re-measure in the Release chat app: GPU 22, ANE 6 tok/s

Run it: device push-verification gotcha + AOT h18p architecture note

Card: category layout (best verified config per platform x compute-unit)

Model card