PerformanceStat.Evaluate folded PowerSupply into the same Min/Max lerp factor
as Heat/Durability/Quality, so zero supply bottomed out at Min instead of 0
(measured: a radiator at zero power still pumped 19-25% of full; three of Cut
7's eight authored terms had Min == Max and were completely inert, since
lerp(x, x, anything) == x).
PowerSupply terms are now accumulated into their own multiplier and applied to
the fully-interpolated, fully-modified value instead of to the interpolation
factor. The term still lives in PerformanceStat.Terms -- it is still authored
per stat and still censused/validated the same way -- it is just no longer
blended into `factor`. Corrected the comments that stated the old premise
(Radiator.cs, Entity.cs, ItemData.cs's IStatContext.PowerSupplyFactor doc).
Pinned in tests/Aetheria.Shared.Tests/PowerCurveTests.cs:
APowerSupplyTermedStatWithNonzeroMinResolvesToExactlyZeroAtZeroSupply and
AMinEqualsMaxStatStillRespondsToItsPowerSupplyTerm -- both fail under the
reverted (lerp-based) mutation.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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