docs(reforcexy): refine README

Signed-off-by: Jérôme Benoit <jerome.benoit@piment-noir.org>

diff --git a/ReforceXY/reward_space_analysis/README.md b/ReforceXY/reward_space_analysis/README.md
index 3ad03972d842576324952e52c882c67275fe9fb9..901514fa88dec8b286a575d5e67f1538959258fc 100644 (file)
--- a/ReforceXY/reward_space_analysis/README.md
+++ b/ReforceXY/reward_space_analysis/README.md
@@ -433,9 +433,9 @@ done
 
 Combine with other overrides cautiously; use distinct `out_dir` per configuration.
 
-### PBRS Rationale
+### PBRS Configuration
 
-Canonical mode seeks near zero-sum shaping (Φ terminal ≈ 0) ensuring invariance: reward differences reflect environment performance, not potential leakage. Non-canonical modes or additives (entry/exit) trade strict invariance for potential extra signal shaping. Progressive release & spike cancel adjust temporal release of Φ. Choose canonical for theory alignment; use non-canonical or additives only when empirical gain outweighs invariance guarantees. Symbol Φ denotes potential. See invariance condition and drift correction mechanics under PBRS section.
+Canonical mode enforces zero-sum shaping (Φ terminal ≈ 0) for theoretical invariance. Non-canonical modes or additives modify this behavior. Choose canonical for standard PBRS compliance; use non-canonical when specific shaping behavior is required.
 
 ### Real Data Comparison