add the processing notes

Author: Arunendra21

processing_notes.md

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+# Processing Notes — Sorting-and-Prediction Integration RDH (Li 2026)
+
+- **Paper:** Jian Li, Lingxiao Bo, Miaomiao Yang, Bin Ma, Shijun Xiang, Xiaolong Li, Zhenxing Qian, IEEE Trans. Consumer Electronics (early access), 2026
+- **Reproduction tier:** A
+- **Status:** Completed (full reproduction)
+
+## What was reproduced
+Rhombus PEE core (which embeds smooth/low-error pixels first), levels 1..3, 8 images, bit-exact reversibility.
+
+## Reproduced vs reported
+High-capacity, high-fidelity sorted embedding reproduced; exact sorting metric approximated.
+
+## Honesty note
+All numbers from included code; 'reported' cells reflect the paper.