Close three critical review findings on the render-bounds-channel verdict

Verdict can no longer print a false EXACT on an on-grid end, no longer names a
bounds channel a content-derived render never consulted, and the grid-align doc
premise is corrected without implementing it.

src/shell/capture/capture_orchestrator.cpp

@@ -231,7 +231,8 @@ CaptureResult renderOffline(CaptureScope scope,
 // caller can report success/failure. Load-bearing principle holds: writes a file +
 // a bank index entry ONLY; never touches the arrange/timeline. Non-destructive: the
 // out-of-scope FX/fader/pan chain is fully restored on every path (FxBypassGuard),
-// and the backend restores every RENDER_* setting.
+// and the backend restores every RENDER_* setting it changed plus, on the
+// time-selection bounds channel, the project time selection it borrowed.
 //
 // On success, res.sample.id carries the LANDED bank-index id (S8): the newly-added id
 // on a fresh add, or the EXISTING entry's id on a hash-dedup collapse — so the S8