Renamed with git mv to preserve history. Refreshed the content to match
the current state of the project:
- Java 11 build target (was 16) — explicit warning not to reintroduce
records / pattern matching / switch expressions.
- New three-layer architecture: util/ (always on) + features/ (opt-in
via setupX()) + builtin/ (top-level commands).
- New features documented: messages, broadcasts, GUI framework, team
settings, moderation skeleton.
- Diagrams layout: util/ + features/<feature>/ + cross-cutting at root.
- File generation pattern documented: <plugin>-messages.yml,
<plugin>-broadcasts.yml, <plugin>-team-config.yml in dataFolder.
- Maven build + deploy commands and Gitea Packages publishing URL.
- Git workflow conventions: HTTPS URL with token, co-author trailer.
setup.md tree updated (GEMINI.md → CLAUDE.md reference).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>