Service both VST3 parameter channels, and promote pitch key-track and Trigger length so all 44 ids issue

The SDK's own single-component sample drains inputParameterChanges in
process() and implements setParamNormalized; automation was reading the
GUI channel alone. The audio thread now patches a block it solely owns.

tests/test_deck_groups_state.cpp

@@ -49,9 +49,10 @@ static void testEveryDeckControlIsClassifiedIntoOneOfTheThreeCommitTiers() {
 
     // The note-on-latched tier: published like a live control, read only at note-on. Asserted as
     // its OWN state rather than as "not Reload" — the whole point of widening the predicate is
-    // that Rate must not fall back into either neighbour, and Γ-W4-T1 reads this classification
-    // to decide what it exposes to the host.
-    const DeckParam latched[] = {DeckParam::kRate};
+    // that none of these falls back into either neighbour, and the VST3 parameter surface reads
+    // this classification to decide what it exposes to the host.
+    const DeckParam latched[] = {DeckParam::kRate, DeckParam::kKeyTrack,
+                                 DeckParam::kTrigLength};
     for (DeckParam p : latched) CHECK(deckParamCommit(p) == LiveCommit::NoteOnLatched);
 
     // Everything else reloads or rebuilds; deck_groups.h is the home for why each exclusion
@@ -60,7 +61,6 @@ static void testEveryDeckControlIsClassifiedIntoOneOfTheThreeCommitTiers() {
         DeckParam::kPlayMode, DeckParam::kPitchEngine, DeckParam::kPitchEnvEnable,
         DeckParam::kFilterEnable, DeckParam::kFilterLaw,
         DeckParam::kAmpVelCurve, DeckParam::kPitchVelCurve, DeckParam::kFilterVelCurve,
-        DeckParam::kKeyTrack, DeckParam::kTrigLength,
         DeckParam::kAmpEnvSelect, DeckParam::kPitchEnvSelect, DeckParam::kFilterEnvSelect,
         DeckParam::kAmpEnvMode, DeckParam::kPitchEnvMode, DeckParam::kFilterEnvMode,
         DeckParam::kVoiceCount, DeckParam::kVoiceMode,
@@ -99,7 +99,10 @@ static void testOnlyALiveControlsDragTakesTheLiveTier() {
     // Rate keeps its own tier through the drag site: it must not arrive as Live (which would let
     // it move a sounding note) nor as Reload (which would re-decode the WAV under a swept knob).
     CHECK(knob(DeckParam::kRate) == LiveCommit::NoteOnLatched);
-    CHECK(knob(DeckParam::kTrigLength) == LiveCommit::Reload);
+    // Trigger length resolves playEnd_ and key-track the pitch ratio — both facts a voice fixes
+    // at note-on, which is the latched tier's own definition rather than the reload tier's.
+    CHECK(knob(DeckParam::kTrigLength) == LiveCommit::NoteOnLatched);
+    CHECK(knob(DeckParam::kKeyTrack) == LiveCommit::NoteOnLatched);
     // Master gain is Live and reaches the audio BESIDE the live block rather than through it —
     // one atomic the audio thread applies as a post-sum multiply. Classifying it Reload would
     // claim a gain move re-decodes the WAV, which it never did.