docs: add initial design bundle

design/user-stories/us-001-build-and-release-plugin.md

@@ -0,0 +1,26 @@
+---
+type: User Story
+title: "US-001: Build and release the plugin"
+description: Give maintainers repeatable Purpur builds, automated verification, and versioned Gitea releases.
+status: backlog
+---
+
+# US-001: Build and release the plugin
+
+As a **plugin maintainer**, I want repeatable builds and automated releases so that tested, correctly versioned artifacts can be distributed consistently.
+
+## Acceptance criteria
+
+- [ ] The Gradle project compiles against Purpur API `26.2.build.2618-stable` using a Java 25 toolchain.
+- [ ] Compiler lint warnings fail the build.
+- [ ] Automated JUnit 5 tests run as part of the Gradle check lifecycle.
+- [ ] Pushes and pull requests build and test the plugin in Gitea Actions.
+- [ ] Pull requests validate conventional commit messages.
+- [ ] CI stores a development JAR as a workflow artifact.
+- [ ] Main-branch conventional commits drive semantic versioning.
+- [ ] A successful release builds a versioned JAR and attaches it to the corresponding Gitea release.
+- [ ] Build files, Gradle wrapper, workflows, and release behavior follow `../spigot-base/` where applicable while using Spigot Inventory Helper names and identifiers.
+
+## Related
+
+- [User-story catalog](index.md)