Bound the automation hold to the window the model has not caught up on, and make that authority model stated, enforced and tested

tests/test_param_units.cpp

@@ -136,6 +136,28 @@ static void testTheHostAndTheEditorAgreeOnEveryDefaultPosition() {
     }
 }
 
+// The criterion names the editor's DOUBLE-CLICK, and that gesture is resetDeckParam, not
+// deckParamNorm over a default-constructed set. Asserted directly: reset a DIALLED set and its
+// stored field must read back at exactly the normalized value the host resets to. (The two
+// instance scalars have no resetDeckParam entry — the shell resets those from InstrumentParams,
+// which the test above covers at the same position.)
+static void testADoubleClickResetLandsOnTheHostsDefaultNormalized() {
+    using reasampler::instrument::ui::deckParamNorm;
+    using reasampler::instrument::ui::resetDeckParam;
+    using reasampler::instrument::ui::setDeckParam;
+    for (const ParamRow& row : exposedParams()) {
+        if (valueHomeFor(row.deck) == ValueHome::InstanceScalar) continue;
+        PlaySeconds dialled;
+        // Away from the default first, so a reset that did nothing at all cannot pass.
+        setDeckParam(row.deck, dialled, 0.37, /*segment=*/0);
+        CHECK_ID(deckParamNorm(row.deck, dialled) != defaultNormalized(row.deck) ||
+                     defaultNormalized(row.deck) == 0.37,
+                 row.id);
+        resetDeckParam(row.deck, dialled);
+        CHECK_ID(deckParamNorm(row.deck, dialled) == defaultNormalized(row.deck), row.id);
+    }
+}
+
 static void testTheFiltersFourTakeTheirStoredNormVerbatim() {
     // Their stored value IS the normalized one, so no taper may participate in their default:
     // this fails the moment someone routes them through toNormalized(toPlain(x)).
@@ -218,6 +240,7 @@ int main() {
     testEveryUnitStringAndRangeMatchesTheSpecifiedTable();
     testEveryDefaultHasAnExactNormalizedPreimage();
     testTheHostAndTheEditorAgreeOnEveryDefaultPosition();
+    testADoubleClickResetLandsOnTheHostsDefaultNormalized();
     testTheFiltersFourTakeTheirStoredNormVerbatim();
     testToPlainIsMonotoneAcrossTheWholeTravel();
     testTheEndpointsAreTheDeclaredPlainRange();