v1.0.0

First release. Single-player only; multiplayer is not supported in this version.
PC only. Passes the GIANTS TestRunner (0.9.19).

Added

• Demand-based selling prices. Demand is tracked per selling station and fill
  type; the effective price falls continuously toward a floor as you sell more of
  one crop at one station within an in-game month (no hard sell cap). Prices
  recover when a new month begins. Implemented by overwriting
  SellingStation:getEffectiveFillTypePrice (price) and SellingStation:sellFillType
  (records consumed liters, server-authoritative).
• "Saturated market" penalty line in the income HUD, next to Harvest Income,
  showing the money lost to saturation. Uses a custom MoneyType.register
  category plus display-only g_currentMission:addMoneyChange, so the balance
  (already reduced by the price hook) is not double-charged. Accumulated per farm
  across an unload and shown as one line.
• Difficulty scaling tied to the savegame's economic difficulty (read from
  missionInfo.economicDifficulty, adjusts live if changed in-game):
  Easy 0.60 floor / 300k L, Normal 0.50 / 150k L, Hard 0.40 / 75k L.
• Per-savegame persistence of demand state (XML in the savegame folder),
  restored on load.
• Procedural mod icon (512�512 BC1) via tools/gen_icon.py.
• English + German descriptions and the "Saturated market" label.
• Standalone unit tests for the pure demand math (tests/DemandModel.test.lua).

Notes

• Layers on top of the base game's dynamic pricing rather than replacing it.
• Single-player only; multiplayer is not supported in this version (planned for
  a later version).
• General economy rebalancing (e.g. a wholesale/retail spread) is intentionally
  out of scope � left to dedicated economy mods for compatibility.