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Scottlg f5e0642b39 Arena polish: in-run HUD, no free loot, retire-with-winnings

- HUD arena status (top center): live wave number and run gold,
  driven by GameState signals, torn down cleanly on HUD.reset()
- Free floor weapons removed: the initial sword/shield spawn is gone
  and manually placed level.tscn weapons are deleted server-side at
  init. Gear now only enters play via the armory or enemy drops.
- Retire to Camp: new escape-menu button (shown only while alive in
  an active run) banks 100% of run gold and keeps all gear - the
  counterweight to death's 10% settlement. Exit Game and window close
  also bank winnings before quitting.
- CLAUDE.md rewritten for the gladiator arena era: core loop,
  autoloads, economy API, RPC patterns, verification workflow.

2026-07-01 23:47:03 +01:00