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

src/shell/actions/CLAUDE.md

@@ -16,8 +16,10 @@ is owned by other directories and only skinned here.
 - **Ingest is an extension act; the instrument is a read-only bank consumer.** Any
   instrument code path that captures, imports, inserts a timeline item, or writes
   back into the bank is a bug — the instrument reads and plays only.
-- **`arrange_drop_win` is the only timeline-placing shell in this directory**, and
-  it places because the USER dragged a card onto the arrange. Root `CLAUDE.md`'s
+- **`arrange_drop_win` is the only timeline-placing shell IN THIS DIRECTORY** — the
+  claim scopes here, not to the system: `shell/capture` holds two more
+  (`RunInsertSelected` and `render_in_place`, the third verb). `arrange_drop_win`
+  places because the USER dragged a card onto the arrange. Root `CLAUDE.md`'s
   capture/placement separation forbids a CAPTURE placing an item; a deliberate drop
   is placement on demand. No other module here may grow an `InsertMedia` call.
 - **Ingest NEVER inserts a timeline item.** Arrange capture→bank→assign reuses the