MapFrontiers Ownership Transfer

Changelog — 0.1.0-beta.3

Since this is the first public version, I’d again avoid a “Fixed” section:

# MapFrontiers Ownership Transfer 0.1.0-beta.3

## Initial Public Release

- Added ownership transfer commands for MapFrontiers 3 global frontiers.
- Added `/frontiertransfer <frontier> <player>`.
- Added `/mftransfer <frontier> <player>` alias.
- Added frontier lookup by name.
- Added support for quoted frontier names containing spaces.
- Added UUID fallback for duplicate frontier names.
- Added owner protection so normal players can transfer only their own frontiers.
- Added OP bypass allowing server operators to transfer any supported frontier.
- Added transfers to offline players who have joined the server before.
- Added OP-only transfers to valid Minecraft usernames that have never joined the server.
- Added TAB autocomplete for known player usernames.
- Added safe **create → verify → delete** transfer handling.
- Added rollback attempt if removal of the original frontier fails.
- Added support for transferring previously transferred frontiers again.
- Added protection for frontiers managed by unrelated plugins.
- Added protection for frontiers containing shared users.
- Server-side only — no client installation required.

### Known Limitation

MapFrontiers does not currently expose a public direct owner setter, so transferring a frontier recreates it and gives it a new internal UUID.

### Tested With

- Minecraft **1.21.1**
- NeoForge **21.1.248**
- MapFrontiers **3.0.0-beta.12**
- Java **21**