Bake window: derive it from the rate the voice actually reads at, so a dialled Rate or downward Pitch no longer truncates the file

tests/test_deck_values.cpp

@@ -317,6 +317,12 @@ static void testEveryDefaultHasAnExactNormalizedPreimage() {
     CHECK(deckParamNorm(DeckParam::kTrigLength, d) == d.trigger.lengthFraction);
     CHECK(deckParamNorm(DeckParam::kTrigHold, d) == d.trigAhd.holdFraction);
     CHECK(deckBipolarFromNorm(deckParamNorm(DeckParam::kFilterModAmt, d)) == d.filter.modAmount);
+    // The PITCH/RATE pair. Rate's preimage is the taper's unity detent, which sits at true
+    // centre only because these bounds are reciprocal; Pitch's is the depth taper's exact zero.
+    CHECK(rateRatioFromNorm(deckParamNorm(DeckParam::kRate, d), kRateMinRatio, kRateMaxRatio) ==
+          d.playRate);
+    CHECK(depthSemitonesFromNorm(deckParamNorm(DeckParam::kPitch, d), kPitchDepthMaxSemis) ==
+          d.pitchOffsetSemitones);
     CHECK(util::curveFromKnobNorm(deckParamNorm(DeckParam::kAttackCurve, d)) ==
           d.adsr.attackCurve);
     // Master gain's unity: the case where a hair off is an audible gain error rather than a