Docs: record cross-rate playback; finish SEPT_VERIFY sample-rate checks

docs/SEPT_VERIFY.md

@@ -74,7 +74,7 @@ project rate 48000, unless a check says otherwise.
 - [ ] Run stable and beta ReaSampler 9000 side by side and open both editors — each works normally,
   no crash
 
-## 5. Live spline-envelope drags (in progress, Sept 2026)
+## 5. Live spline-envelope drags (landed Sept 2026)
 
 - [ ] Set the amp envelope to Spline, hold a note, and drag a knot — the sound audibly follows the
   shape change during the drag itself
@@ -90,7 +90,7 @@ project rate 48000, unless a check says otherwise.
 - [ ] With a note held, add a new point to the spline — audible immediately
 - [ ] With a note held, delete a point from the spline — audible immediately
 
-## 6. Sample-rate playback (in progress, Sept 2026)
+## 6. Sample-rate playback (landed Sept 2026)
 
 - [ ] In a 48 kHz project, import a 44.1 kHz file via the Media Explorer into ReaSampler 9000; play
   its root note — same pitch and length as the file auditioned in the Media Explorer. Repeat in
@@ -105,3 +105,9 @@ project rate 48000, unless a check says otherwise.
 - [ ] Existing projects that used mismatched-rate samples WILL sound different now (correct pitch)
   — reopen one and confirm it's the expected change
 - [ ] Same-rate samples sound exactly as before
+- [ ] In Preserve mode at matched rate, set Rate to ~200% — sounds clean (this changed with the
+  splice-crossfade fix; confirm it's an improvement, not a regression)
+- [ ] Load a file more than 32x the project rate (e.g. a 384 kHz file in an 11.025 kHz project, if
+  one is available) — the editor title shows the refusal message, the sample plays silent, the
+  message clears when another sample is loaded, and a bake shows "cannot render"
+- [ ] The refusal text is not truncated at the default editor width