Release DuelPlugin v1.0.4 · yangzijian52/DuelPlugin

What changed

Added English SpigotMC resource-page BBCode and full documentation BBCode.
Added a manual SpigotMC publishing checklist with suggested fields and warnings.
Added the MIT License and project changelog.
Added release-material links to the README and marked the Paper 26.1 document as historical.
No plugin code, pom.xml, plugin.yml, version, or packaged JAR content changed; the release remains v1.0.4.
Recommended SpigotMC resource type: Free ($0) because DuelPlugin is a compact, single-purpose MIT-licensed plugin with no commercial-only feature, economy, marketplace, or paid service.

Paper 26.2 only; native Spigot compatibility is not claimed.
Java 25 or newer.
EssentialsX is required and must provide warp a and warp b.
In-game messages are hard-coded in Chinese.
The SpigotMC resource page, documentation and support channel are English-only. Chinese-language support is not provided on SpigotMC.
Queue and duel state are memory-only; the plugin has no persistent data, config file, permissions, aliases, admin commands, economy, or transaction system.
Review the documented single-duel, disconnect, environmental-death, and missing-warp limits before production use.

Java 25 and Maven clean package: BUILD SUCCESS.
Five Java source files compiled successfully.
The repository contains no automated test source files; Maven completed the test phase with 0 tests executed.
No new live-server test was performed. The existing plugin was reported working on Paper 26.2 before this documentation-only update.
Packaged plugin.yml verified as version 1.0.4, API version 26.2, with depend: [Essentials].
JAR contains only DuelPlugin classes; Paper API and EssentialsX are not bundled.
The rebuilt JAR's 19 entries were byte-for-byte identical in content to the published asset; the existing release asset was retained.
UTF-8, English-only SpigotMC material, BBCode tag balance, and git diff --check validations passed.