refs #170 Refresh README

Summary

  • Refresh README for the current Windows 11 / Java 25 focused codebase
  • Document 7-key / Charge Note scope, runtime commands, build/test commands, packaging tasks, and repository layout
  • Note parser sibling repository requirements and the BeatorajaLauncher entry point

Verification

  • git diff --check
  • Claude Code review: No findings

Redmine: https://redmine.izu-san.com/issues/170

マージリクエストレポート

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