plots: AUTHORITATIVE coin values (non-uniform), 0.22.5 -> 0.22.6

User confirmed in-game tooltip values:
  spur=1, bevel=8, sprocket=16, cog=64, crown=512, sun=4096.

Chain is non-uniform (x8, x2, x4, x8, x8). My earlier guesses
(uniform x8, assuming Sun=64 Cogs) gave consistent but wrong
intermediate values. Now sourced from the mod's own tooltip, not
triangulated.

Plot prices at 100/250/600 spurs now mean roughly:
  100 spurs = 6 bevels + 4 spurs (1 sprocket + 5 bevels + 4 spurs)
  250 spurs = 3 cogs + 3 bevels + 2 spurs
  600 spurs = 9 cogs + 3 bevels (... still small change tier)

User-side: edit PLOT_DEFS in plots.js to set real prices once the
spawn marketplace and economy scale are decided.

pack/overrides/kubejs/server_scripts/plots.js

@@ -64,15 +64,15 @@ const PLOT_DEFS = new Map([
 const REFUND_FRACTION = 0.5;     // released plots refund 50% of purchase price
 
 // ─── Numismatics coin handling ────────────────────────────────────────
-// 6 denominations on a uniform x8 chain (verified in-game 2026-05-23 via
-// user-reported Sun = 64 Cogs, which back-calculates to these values).
+// Authoritative values from in-game tooltips (verified by user 2026-05-23).
+// Chain is NON-uniform (x8, x2, x4, x8, x8) -- don't assume otherwise.
 const COIN_VALUES = {
     'numismatics:spur':     1,
     'numismatics:bevel':    8,
-    'numismatics:sprocket': 64,
-    'numismatics:cog':      512,
-    'numismatics:crown':    4096,
-    'numismatics:sun':      32768,
+    'numismatics:sprocket': 16,
+    'numismatics:cog':      64,
+    'numismatics:crown':    512,
+    'numismatics:sun':      4096,
 };
 const DENOMS_DESC = ['numismatics:sun', 'numismatics:crown', 'numismatics:cog',
                      'numismatics:sprocket', 'numismatics:bevel', 'numismatics:spur'];