Document quick 8-window KLD gate

README.md

@@ -126,7 +126,8 @@ agreement, per-domain means, and a 10,000-sample 95% bootstrap confidence
 interval clustered by window. The window is the sampling unit; individual
 tokens must not be treated as independent observations.
 
-For quick iteration use windows 0-7. Run all 32 windows for candidate selection.
+For quick iteration add `--stop-window 8` to capture, finalize, and compare so
+only windows 0-7 are required. Run all 32 windows for candidate selection.
 Capture the winner a second time if candidates differ by only a few thousandths.
 
 ## Repeat noise and validation
@@ -144,4 +145,3 @@ This is within the observed runtime/kernel nondeterminism. Differences around
 
 All 32 files were read back with safetensors, their key/dtype/shape checked,
 and their complete contents hashed. The hashes are in `ref/manifest.json`.
-