Document filtering and add real data excerpt

README.md

@@ -55,7 +55,37 @@ strongly off-policy steering instructions. This addresses an early failure mode
 which models reproduced the markup but did not reliably follow the hierarchy.
 
 The release contains 10,000 traces drawn from 2,138 source prompt indices. Multiple
-rollouts may therefore share a source prompt. Traces are capped at 16,384 tokens.
+rollouts may therefore share a source prompt. Although traces are capped at 16,384
+tokens, the published dataset is not the raw generation stream: records were cleaned
+and filtered after generation. The final release has 10,000 unique generation keys,
+no duplicate generation keys, no control tags leaking into final answers, and
+normalized boundaries between consecutive `<exec>` and `<steer>` blocks.
+
+### Example from the dataset
+
+The following is a verbatim excerpt from released record `source_index=17`,
+`rollout_index=0`. The ellipsis marks later decision--execution pairs omitted only for
+display.
+
+```text
+User:
+Determine the order, degree, linearity, unknown function, and independent variable of
+the differential equation \( y'' - 5x(y')^4 = e^x + 1 \).
+
+Assistant completion:
+<think>
+<steer>Define the goal</steer>
+<exec>Okay, so I need to figure out the order, degree, linearity, unknown function,
+and independent variable for the differential equation \( y'' - 5x(y')^4 = e^x +
+1 \). Hmm, let's start by recalling what each of these terms means.</exec>
+<steer>Determine the order</steer>
+<exec>First, the order of a differential equation is determined by the highest
+derivative present in the equation. Looking at the equation, I see \( y'' \) which is
+the second derivative of y with respect to x. There's also \( y' \), which is the
+first derivative, but since the highest is second, the order must be 2. So, order =
+2.</exec>
+...
+```
 
 ## Dataset structure