docs(build): start plugin foundation

design/log.md

@@ -18,3 +18,8 @@ description: Chronological record of material decisions affecting the Spigot Inv
 
 - The Sorting Stick uses a vertical recipe in the crafting grid's center column: a Chest or Barrel above Redstone Dust, with a Stick at the bottom.
 - Either storage-block variant produces one Sorting Stick.
+
+## 2026-09-04 — Implementation started
+
+- Approved implementation begins with the tested Gradle and Purpur foundation, followed by the Sorting Stick, inventory sorting, and automatic tool replacement.
+- Work proceeds one user story at a time using red-green-refactor cycles and a verified commit and push after each completed story.

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

@@ -2,7 +2,7 @@
 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
+status: in-progress
 ---
 
 # US-001: Build and release the plugin