feat(S9/S8): bank-generation change-detection + instrument-side assignment reader

Extension stamps a monotonic bank_generation counter, bumped at content
mutations; the VST3 instrument polls it off-thread on an editor timer and
consumes assignment requests, refreshing playback hands-free.

src/main.cpp

@@ -216,7 +216,10 @@ static void CommitRealtimeResult(const reasampler::CaptureResult& res)
     // index AddResult — even a hash-collapse still WROTE a file the tool owns, and the
     // manifest dedups a repeat path itself (Phase R prune reconciles manifest vs index).
     g_session.owned().add(res.sample.relativePath);
-    g_session.saveToActiveProject();  // persist book + manifest + MarkProjectDirty (travels with .rpp)
+    // S9: a capture add changes what a live instance could play (a new sample landed in the
+    // active bank) -> bump before the persist so the stamped generation refreshes instances.
+    g_session.bumpBankGeneration();
+    g_session.saveToActiveProject();  // persist book + manifest + generation + MarkProjectDirty (travels with .rpp)
 }
 
 // Advance any in-flight realtime capture one tick. Cheap when none is running (a
@@ -852,6 +855,9 @@ static std::string RunCapture(const reasampler::CaptureActionDef& def)
     // `banks` + `owned_files` keys) so the capture survives Save / close+reopen (M4) and
     // travels with the .rpp. saveToActiveProject also clears the retired legacy key and
     // calls MarkProjectDirty. Non-destructive: writes only our own ext-state keys.
+    // S9: a capture add is a bank-content change -> bump before the persist so an assigned
+    // live instance refreshes hands-free (the S8 capture+assign path builds on this).
+    g_session.bumpBankGeneration();
     g_session.saveToActiveProject();
 
     // Hand the LANDED bank-index id back to the assign path (S8): captureAndIndexOne
@@ -1042,8 +1048,12 @@ static void RunBatchCaptureItems()
     }  // selGuard restores the original selection here, on every path
 
     // Persist ONCE for the whole batch (one ext-state write) — only if something landed.
-    if (anyAdded)
+    // S9: one bump for the whole batch (coalesced) — the counter is monotonic, not per-sample,
+    // so a single increment past the last-seen value is enough to trigger one instance reload.
+    if (anyAdded) {
+        g_session.bumpBankGeneration();
         g_session.saveToActiveProject();
+    }
 
     ShowConsoleMsg((outcome.summaryLine("item") + "\n").c_str());
 }
@@ -1159,8 +1169,11 @@ static void RunBatchCaptureRazor()
         }
     }  // selGuard restores the original track selection here, on every path
 
-    if (anyAdded)
+    // S9: one coalesced bump for the whole razor batch (see the item-batch note above).
+    if (anyAdded) {
+        g_session.bumpBankGeneration();
         g_session.saveToActiveProject();
+    }
 
     ShowConsoleMsg((outcome.summaryLine("razor area") + "\n").c_str());
 }
@@ -1344,7 +1357,12 @@ static void RunRecaptureFromSource()
         // Record the regenerated file in the owned manifest (a new file the tool wrote);
         // the superseded old file becomes an orphan reclaimed by Phase R prune.
         g_session.owned().add(updated.relativePath);
-        const bool persisted = g_session.saveToActiveProject();  // book + manifest + MarkProjectDirty
+        // S9: re-capture-in-place regenerates the SAME id's audio — the exact case the
+        // hands-free refresh exists for (an instance referencing this id keeps playing the
+        // OLD audio until it reloads). Bump inside the undo block so undo rolls back the
+        // generation with the rest of the blob.
+        g_session.bumpBankGeneration();
+        const bool persisted = g_session.saveToActiveProject();  // book + manifest + generation + MarkProjectDirty
         Undo_EndBlock2(nullptr, persisted ? "ReaSampler: re-capture from source" : "",
                        persisted ? UNDO_STATE_MISCCFG : 0);
     }