fix(voice): declick every takeover of a sounding voice — mono retrig/fallback and poly at-cap steal; same-block double-steal keeps its seed; over-cap repro proves the engine steals exactly one voice per note-on

src/vst/reasampler_processor.h

@@ -52,6 +52,11 @@ struct LoadedInstrument {
     PreviewCard preview;  // Phase S: the isolated preview voice — never part of the pool
     std::uint64_t installedAt = 0;  // reload generation at which this was installed
 
+    // The takeover declick (GA fix) is opted IN here — the PRODUCT default: any restart of a
+    // sounding voice (mono Retrigger takeover/fallback, cross-sample legato restart, POLY
+    // at-cap steal) fades the cut tone over a few ms instead of clicking. The pure core
+    // defaults it off (regression baseline) — same layering as the kDefaultPitchEngine
+    // product default.
     LoadedInstrument(Keymap km, std::size_t maxVoices,
                      std::uint64_t gen, std::size_t preserveVoiceCap = 0,
                      std::int64_t preserveWindowFrames = 0,
@@ -59,7 +64,7 @@ struct LoadedInstrument {
                      MonoTrigger monoTrigger = MonoTrigger::Retrigger)
         : keymap(std::move(km)),
           engine(maxVoices, keymap, preserveVoiceCap, preserveWindowFrames,
-                 voiceMode, monoTrigger),
+                 voiceMode, monoTrigger, /*takeoverDeclick=*/true),
           preview(keymap, preserveWindowFrames),
           installedAt(gen) {}