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

src/shell/capture/render_in_place.h

@@ -0,0 +1,18 @@
+#pragma once
+// render_in_place — the third verb: render the selected track's output over the
+// current range to the project's recording path, place it on a new sibling track at
+// the exact position it was rendered from, and move the source to Design. The bank
+// is never read, written, or notified (docs/product/render-in-place.md).
+
+namespace reasampler {
+class ReaSamplerSession;
+}
+
+namespace reasampler::capture {
+
+// Resolves, renders, creates + dresses the sibling track, places the file, and
+// settles both tracks' modes in one undo block. Silent on success (the new track is
+// the feedback) except when the result lands invisible; ShowConsoleMsg on refusal.
+void RunRenderTrackInPlace(ReaSamplerSession& session);
+
+}  // namespace reasampler::capture