Document X-ASR experiment branch

Ariver

2026-06-07 c721471f3778334f0cdcfdd3a098e1353652762a

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5e321004afb61153fb82e5ef58698d5487e5dd089bf0aaa0ba482e657ed3a4ec  PrivateVoice Input-2.1.20-build20260603.1145-arm64-local.dmg
cac25e70e9375610f122e6a8ee3d9813acf0dee23054b6402cd3e5e575d5f1fd  PrivateVoice Input-2.1.20-build20260603.1145-x86_64-local.dmg