UniversalAdmin 0.1.0-alpha.2

Added

• Automatic update checks: dev.universaladmin.update polls the GitHub
  releases API on a jittered interval (default every 6 hours) and, when a
  newer version exists, notifies staff (universaladmin.update.notify) and
  logs a console warning. /admin update (universaladmin.update.apply)
  downloads the latest release's jar into Bukkit's own plugins/update/
  folder (verified against its published SHA-256 checksum) - applied at the
  next restart, never a live hot-swap. update.check-for-updates (default
  true) is the on/off switch; update.check-interval configures the
  background timer.
• Empty-slot placeholders in the Players module's and Staff-Mode's
  inventory/ender-chest editors: a dyed-gray leather armor piece per slot
  (helmet/chestplate/leggings/boots), a grayed-out shield for offhand, and a
  visibly distinct hotbar row - EmptySlotPlaceholder, stripped back to
  null before ever writing to a real inventory.

Changed

• TelemetryPayload's wire format gained a pluginId field (fixed:
  "universaladmin") and renamed universalAdminVersion to
  pluginVersion - the shape a shared, multi-plugin telemetry backend
  expects (see docs/user/telemetry.md). What's
  collected and the opt-out are unchanged.
• telemetry.endpoint now defaults to https://telemetry.0nicki.de/v1/telemetry
  (the official nicki41-telemetry instance) instead of empty - a fresh
  install now reports anonymous usage statistics out of the box;
  telemetry.enabled: false (or clearing telemetry.endpoint) still turns
  it off entirely. See docs/user/telemetry.md.

Fixed

• Closing a live inventory/ender-chest editor (Players module or the
  Staff-Mode Inspector tools) showed the "Done." confirmation twice - both
  halves of the split main-storage/equipment write notified independently;
  now only the first does.

Full Changelog: v0.1.0-alpha.1...v0.1.0-alpha.2