docs(design): define creeper aura plugin

design/user-stories/us-005-administer-player-progression.md

@@ -0,0 +1,30 @@
+---
+type: User Story
+title: "US-005: Administer player progression"
+description: Let authorized administrators inspect and modify online or offline player progression.
+status: backlog
+---
+
+# US-005: Administer player progression
+
+As a **server administrator**, I want to inspect and modify player progress so that I can support players and correct mistakes.
+
+## Acceptance criteria
+
+- [ ] `/creeperaura progress <player>` reports another player's kills, rank, next threshold, and remaining kills.
+- [ ] `/creeperaura set <player> <kills>` sets a non-negative lifetime kill total and reconciles the player's rank to that explicit administrative value.
+- [ ] `/creeperaura add <player> <kills>` adjusts a player's kill total without allowing a negative result.
+- [ ] Inspection and modification work for known offline players as well as online players.
+- [ ] Players are resolved to stored UUIDs so name changes do not create duplicate progression records.
+- [ ] Administrative changes are persisted immediately.
+- [ ] An online affected player's boss bar and rank state are updated after a change.
+- [ ] Administrative commands require distinct, documented permissions suitable for inspection and modification.
+- [ ] Unauthorized use does not disclose another player's progression.
+- [ ] Invalid player names, ambiguous identities, invalid numbers, and storage failures produce clear responses without partial changes.
+- [ ] Successful administrative changes are written to the server log with the actor, target, old value, and new value.
+
+## Related
+
+- [Check personal progress](us-004-check-personal-progress.md)
+- [Configure aura progression](us-006-configure-aura-progression.md)
+- [User-story catalog](index.md)