Render in place: a track's output to a new sibling, source to the bench

src/shell/capture/capture.h

@@ -30,6 +30,14 @@ enum class WavBitDepth {
     Float32,
 };
 
+// Where the render lands. TWO VALUES, never a caller-supplied path string: the
+// backend resolves each to a directory itself, which is what makes "write into the
+// bank folder" inexpressible from the ProjectMedia side and vice versa.
+enum class CaptureDestination {
+    Bank,          // <projectDir>/reasampler_bank — every capture path
+    ProjectMedia,  // the project's recording path — the render-in-place verb only
+};
+
 // One capture, independent of source mode.
 struct CaptureRequest {
     SourceMode sourceMode = SourceMode::MasterMix;
@@ -75,6 +83,9 @@ struct CaptureRequest {
     // The one home for that fallback rule; both backends populate Sample::displayName
     // from here rather than each spelling the condition out.
     std::string label() const { return displayName.empty() ? baseName : displayName; }
+
+    // Default Bank: every existing entry point renders into the bank untouched.
+    CaptureDestination destination = CaptureDestination::Bank;
 };
 
 // Every failure is an explicit code, never a thrown exception across the REAPER boundary.
@@ -95,6 +106,11 @@ struct CaptureResult {
     CaptureStatus status = CaptureStatus::RenderFailed;
     Sample        sample;        // valid only when status == Ok
     std::string   message;       // human-readable detail for the console log
+
+    // The file the render actually landed, absolute — the only handle a caller that
+    // banks nothing has on its own output (sample.relativePath is empty on the
+    // ProjectMedia destination). Set on the Ok path only.
+    std::string   absolutePath;
 };
 
 // Deterministic offline-render backend: master mix / time selection / selected