apple ppo status | create --variant b[,c] | upload --variant b | start | stop: v2 experiments (platform IOS, traffic
proportion), one treatment per shots variant (max 3), a treatment localization per App Store locale, and the variant
renders synced into the treatment screenshot sets (shared MD5-idempotent set sync with apple screenshots, which no
longer creates sets on --dry). start / stop ask first and are not MCP tools; MCP: apple_ppo_status, apple_ppo_create,
apple_ppo_upload. Play experiments stay console-only (documented).
apple.iphoneMedium (off by default): iphone-medium size key, 1206 x 2622 (1179 x 2556 accepted), uploaded as
APP_IPHONE_61; rendered, checked, required and uploaded only when enabled. Apple's scaling rule documented in the config
and the store-screenshots skill.
