feat(persist): owned-file manifest seam — capture records created files (B-cap)

Pure OwnedFileManifest (relative paths, dedup, JSON round-trip) persisted
under sibling owned_files ext-state key; both capture commit paths record;
joins the R-B undo-reload set. Phase R prune consumes it later.

src/main.cpp

@@ -145,7 +145,12 @@ static void CommitRealtimeResult(const reasampler::CaptureResult& res)
         return;
     }
     reasampler::AddResult added = g_session.bank().add(res.sample);
-    g_session.saveToActiveProject();  // persist + MarkProjectDirty (travels with .rpp)
+    // B-cap: record the file the capture created in the owned-file manifest, at the same
+    // point the Sample is added and before the same persist. Recorded regardless of the
+    // 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)
 
     std::string log = "ReaSampler: " + res.message + "\n";
     log += "  bank size now " + std::to_string(g_session.bank().size()) +
@@ -615,10 +620,15 @@ static void RunCapture(const reasampler::CaptureActionDef& def)
 
     // Add to the ACTIVE bank: g_session.bank() resolves to book.activeIndex() (B2).
     reasampler::AddResult added = g_session.bank().add(res.sample);
-    // Persist the updated book into the active project's ext state (the `banks` key)
-    // 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.
+    // B-cap: record the created file in the owned-file manifest, at the same point the
+    // Sample is added and before the same persist. Recorded regardless of the 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 later).
+    g_session.owned().add(res.sample.relativePath);
+    // Persist the updated book AND manifest into the active project's ext state (the
+    // `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.
     g_session.saveToActiveProject();
 
     std::string log = "ReaSampler: " + res.message + "\n";