econ: sell shop + bounty engine + player commands + FTB Ranks 13-tier

Foundation economy stack — fully command-driven, ready for the custom
UI mod to layer on top later. Built tonight as a single feature batch.

KubeJS scripts:
  pack/overrides/kubejs/server_scripts/economy/
    00_tier_system.js       — 13-tier ladder + admin commands
    02_sell_shop.js         — /bns sell, 9 items, DR + tier-fee
    03_bounty_engine.js     — /bns bounty, 20 bounties, state machine
    04_player_commands.js   — /bns help, /bns me, /bns tier upgrade

plots.js: updated to support multi-plot ownership based on tier slots
  - plotsOwnedBy() returns list, slot cap from TIER_PLOT_SLOTS table
  - /bns plot release now requires plot id (multiple plots possible)
  - /bns plot mine added

FTB Ranks server config:
  pack/overrides/world/serverconfig/ftbranks/ranks.snbt
  13 ranks with ftbchunks.max_claimed_chunks scaling per tier:
    Peasant 9 -> Sovereign 1500 (chunks)
    Peasant 1 -> Sovereign 200 (force-loaded)
  Name format colour codes match the design doc.

Player command surface (everything callable from chat or Telegram bridge):
  /bns help                          full command listing
  /bns me                            tier, balance, plots, bounties
  /bns tier upgrade                  pay spurs, advance to next tier
  /bns plot list|info|buy|release|mine
  /bns sell list|<item> [count]
  /bns bounty list|active|accept|cancel|turnin|completed
  /bns admin tier get|set|list       (op level 2)
  /bns admin info|waystone-*|reset-welcome  (pre-existing)

Tier upgrade flow:
  1. Player runs /bns tier upgrade
  2. KubeJS takes spurs from inventory
  3. KubeJS sets player.persistentData.bnsTier += 1
  4. KubeJS runs `ftbranks add <player> <rank>` so FTB Ranks applies
     the permission nodes (chunk allowance auto-flips)

Cross-file scope: KubeJS 2101 runs all server_scripts in shared Rhino
global scope. Constants (TIER_CONFIG, COIN_VALUES, bnsTier object,
shared functions like giveCoins/countCoins/takeCoins) are declared
once in their owning file and referenced from siblings. Don't redeclare.

Blocked tonight (deferred):
  - Villager trade rebalance: KubeJS 2101.7.2 doesn't ship a
    villagerTrades event. ServerEvents only exposes command/loaded/
    recipes/registry/tags/tick/unloaded. Verified by grepping the
    KubeJS jar's ServerEvents class. No KubeJS-villager-trade addon
    on Modrinth for NeoForge 1.21.1. Either build into the custom
    mod or add a third-party trade-overrides mod (research pending).
  - Custom mod UI screens: no Java toolchain on host, and these
    need visual iteration with the user anyway.

Verified live: server boots clean, all 4 economy scripts log loaded,
port 25565 binds, no EcmaError or EvaluatorException in KubeJS log.
FTB Ranks reload via rcon confirms "Ranks reloaded from disk!"

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

pack/overrides/world/serverconfig/ftbranks/ranks.snbt

@@ -0,0 +1,122 @@
+{
+	# Brass and Sigil 13-tier civic ladder.
+	# Permission nodes:
+	#   ftbchunks.max_claimed_chunks       — wilderness chunk allowance
+	#   ftbchunks.max_force_loaded_chunks  — force-load allowance (~15% of claim cap)
+	#   ftbranks.name_format               — chat colour for this rank
+	# Mirrors TIER_CONFIG in pack/overrides/kubejs/server_scripts/economy/00_tier_system.js.
+	# Tier upgrade flow: KubeJS sets player.persistentData.bnsTier AND runs
+	# /ftbranks add <player> <rankId> to apply this rank's permission nodes.
+
+	peasant: {
+		name: "Peasant"
+		power: 1
+		condition: "always_active"
+		ftbchunks.max_claimed_chunks: 9
+		ftbchunks.max_force_loaded_chunks: 1
+		ftbranks.name_format: "&7{name}"
+	}
+
+	farmer: {
+		name: "Farmer"
+		power: 2
+		ftbchunks.max_claimed_chunks: 18
+		ftbchunks.max_force_loaded_chunks: 2
+		ftbranks.name_format: "&7{name}"
+	}
+
+	citizen: {
+		name: "Citizen"
+		power: 3
+		ftbchunks.max_claimed_chunks: 35
+		ftbchunks.max_force_loaded_chunks: 4
+		ftbranks.name_format: "&f{name}"
+	}
+
+	merchant: {
+		name: "Merchant"
+		power: 4
+		ftbchunks.max_claimed_chunks: 60
+		ftbchunks.max_force_loaded_chunks: 8
+		ftbranks.name_format: "&e{name}"
+	}
+
+	knight: {
+		name: "Knight"
+		power: 5
+		ftbchunks.max_claimed_chunks: 100
+		ftbchunks.max_force_loaded_chunks: 12
+		ftbranks.name_format: "&a{name}"
+	}
+
+	baron: {
+		name: "Baron"
+		power: 6
+		ftbchunks.max_claimed_chunks: 150
+		ftbchunks.max_force_loaded_chunks: 18
+		ftbranks.name_format: "&b{name}"
+	}
+
+	viscount: {
+		name: "Viscount"
+		power: 7
+		ftbchunks.max_claimed_chunks: 220
+		ftbchunks.max_force_loaded_chunks: 26
+		ftbranks.name_format: "&9{name}"
+	}
+
+	earl: {
+		name: "Earl"
+		power: 8
+		ftbchunks.max_claimed_chunks: 300
+		ftbchunks.max_force_loaded_chunks: 36
+		ftbranks.name_format: "&5{name}"
+	}
+
+	marquess: {
+		name: "Marquess"
+		power: 9
+		ftbchunks.max_claimed_chunks: 400
+		ftbchunks.max_force_loaded_chunks: 50
+		ftbranks.name_format: "&6{name}"
+	}
+
+	duke: {
+		name: "Duke"
+		power: 10
+		ftbchunks.max_claimed_chunks: 525
+		ftbchunks.max_force_loaded_chunks: 65
+		ftbranks.name_format: "&6{name}"
+	}
+
+	archduke: {
+		name: "Archduke"
+		power: 11
+		ftbchunks.max_claimed_chunks: 700
+		ftbchunks.max_force_loaded_chunks: 85
+		ftbranks.name_format: "&c{name}"
+	}
+
+	grand_duke: {
+		name: "Grand Duke"
+		power: 12
+		ftbchunks.max_claimed_chunks: 900
+		ftbchunks.max_force_loaded_chunks: 110
+		ftbranks.name_format: "&c{name}"
+	}
+
+	sovereign: {
+		name: "Sovereign"
+		power: 13
+		ftbchunks.max_claimed_chunks: 1500
+		ftbchunks.max_force_loaded_chunks: 200
+		ftbranks.name_format: "&d{name}"
+	}
+
+	admin: {
+		name: "Admin"
+		power: 1000
+		condition: "op"
+		ftbranks.name_format: "&2{name}"
+	}
+}