Trim bake_landing comments: one-home the collapse rationale, fix a ragged header wrap

Also notes why staged.collapsed goes unread at its read site, so a future
reader won't file it as a bug.

src/shell/capture/bake_landing.h

@@ -1,9 +1,9 @@
 #pragma once
 // bake_landing — landing ONE bake request into the loaded project's bank: read the staged
 // WAV, collapse it losslessly to mono when it is dual-mono, hash it, resolve replace-vs-add,
-// write the file, index it, seed its lineage. The scan
-// pass that finds requests across the open tabs and answers them is `bake_land`; this is
-// what it calls per request, and it neither reads nor writes an ext-state key.
+// write the file, index it, seed its lineage. The scan pass that finds requests across the
+// open tabs and answers them is `bake_land`; this is what it calls per request, and it
+// neither reads nor writes an ext-state key.
 
 #include <cstdint>
 #include <string>