feat(base): implement progression system

design/log.md

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+---
+type: Log
+title: Spigot Base Design Log
+description: Chronological record of material decisions affecting the Spigot Base design.
+---
+
+# Spigot Base Design Log
+
+## 2026-08-09 — Initial progression design
+
+- Base progression is sequential: Base I establishes a base, Base II provides navigation, Base III provides personal teleportation, and Base IV permits visitor teleportation.
+- Every secondary progression path requires Base I.
+- A base is cylindrical and begins with a 10-block radius and a vertical extent 25 blocks above and below its set Y coordinate.
+- Only Survival-mode activity contributes progress; repeatedly placing and breaking blocks is permitted.
+- Flight is limited to the base, includes a five-block horizontal warning buffer, and can be toggled by the player.
+- Player-facing administration will initially use commands rather than an inventory UI.
+- The build and release pipeline will follow the neighboring Trigger Spawn project pattern.
+
+## 2026-08-09 — Implementation started
+
+- Approved implementation begins with the tested Gradle/Spigot foundation, validated configuration, and durable player state.
+- Feature work will proceed incrementally using tests before implementation where practical.
+
+## 2026-08-09 — Core implementation checkpoint
+
+- Implemented UUID-keyed YAML state, validated configuration, Base I–IV progression, base sizing, particle navigation, controlled base flight, personal and visitor teleportation, progress feedback, and initial administrative commands.
+- Added Gradle, Spigot metadata, Gitea CI/release workflows, and project documentation based on Trigger Spawn.
+- Verified the implementation with `./gradlew clean check jar`: 34 tests passed and the plugin JAR was produced successfully.
+- User stories remain in progress pending live-server integration verification and completion of runtime administrative configuration editing.