docs(design): define creeper aura plugin

design/user-stories/us-007-build-and-release-plugin.md

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+---
+type: User Story
+title: "US-007: Build and release the plugin"
+description: Give maintainers repeatable Java builds, automated verification, and versioned Gitea releases.
+status: backlog
+---
+
+# US-007: Build and release the plugin
+
+As a **plugin maintainer**, I want automated builds and releases so that tested, correctly versioned plugin artifacts can be distributed consistently.
+
+## Acceptance criteria
+
+- [ ] The Gradle project compiles with Java 17 against Spigot API 26.2.
+- [ ] Automated 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, installation, command, permission, configuration, and release procedures are documented.
+
+## Related
+
+- [User-story catalog](index.md)
+- [Design index](../index.md)