instrument: deliver continuous playback params live to sounding voices via a seqlock block, holding normalized stage position across time edits

src/shell/instrument/reasampler_editor.h

@@ -233,6 +233,17 @@ private:
     // instrument off the audio thread. UI thread only.
     void commitAndReload();
 
+    // The live peer of commitAndReload for a continuously-valued control (isLiveDeckParam):
+    // the same parameter-set write — so a saved project carries the edit exactly as before —
+    // followed by a live publish instead of a rebuild, so the note already sounding follows
+    // the knob. Does not repaint; callers already do. UI thread only.
+    void commitLive();
+
+    // Whether an in-flight drag commits live rather than through a reload. A deck knob is
+    // live per isLiveDeckParam; an envelope-node drag is live only in Gate, where it edits the
+    // AHDSR — in Trigger the same drag rewrites the play span, which is not a live control.
+    bool dragCommitsLive(DragKind kind, int paramId = -1) const;
+
     // Commits `id` as the loaded capture. The one parameter set carries over — it governs
     // whatever is loaded, so a load swaps the sound, not the settings.
     void loadSelection(const std::string& id);