Add Round 4 Parakeet planning docs

Ariver

2026-06-03 35f7ccfbc29b322306983bf800c120ba816e3e8e

 privatevoice.src/app.go

@@ -27,8 +27,8 @@
)

const (
   appVersion        = "2.1.20"
   appBuild          = "20260603.1145"
   appVersion        = "2.1.21"
   appBuild          = "20260603.1327"
   appDisplayVersion = appVersion + " (build " + appBuild + ")"
   appName           = "PrivateVoice Input"