The simple economy is now the default and the old simulation is frozen as the hard model, selectable per game. A nation keeps one resource pool available in every region, fed by public production works rather than private per-region stores, and construction and training begin at once, paced by the region's spare power instead of gathering materials over days.
Money is euro only: a per-inhabitant daily tax funds a treasury spent in a global market, where buy and sell lots trade against the world stock and move its price. The hard economy keeps its per-nation currencies, central banks and exchange rates.
Simple games skip the price-settling warmup and economic migration; the snapshot carries the economy model, the market and the pool figures the client draws. Added the matching test suites and the design briefs under docs/simple_economy.
Unit orders now gather steel and high-tech over the days before training, exactly as buildings do, and clicking a queued order reveals what it is gathering, its reserved budget and the soldiers it will draw.
The trade graph cached a producer-less node list under a stamp that already reflected the producers' stores, so every seeded mine stayed invisible to buyers and rare-good prices settled at a huge multiple of base; the storage nodes are now re-read after production.
Money gifts draw the giver's central-bank reserves in the denomination first, buy the rest from the issuing bank at the market rate, convert into the receiver's currency, and cannot buy from a bank their nation is at war with.
Pruned the finished design briefs (intelligence, stacks, air movement, politics performance, economy balance, training UI and FIXME) and refreshed the index and cross-references.
adrien