v2 methylation QC validated on minfiDataEPIC and against sesame (K-026)

beta r 0.99998 vs sesame 1.28.1 (max |dbeta| 0.011), detection calls 99.1% identical,
noob within 0.5% median; replicate r 0.997; all 21 control metrics pass. Spec deviations
recorded (5-field control lines, pOOBAH formula, minfi sheet keys). User guide section.

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## Unreleased (v2)
+
+**Methylation control QC** (`simurg methyl qc`, `simurg methyl convert-manifest`; MET-001 … MET-018): methylation
+CSV manifests, the 21 control metrics, pOOBAH detection p-values, noob, linear/nonlinear dye bias, β and M-values,
+summary tsv/xlsx/html with a β PCA, per-sample tables; methylation folders load in `simurg qc report`;
+`qc controls --array-type methylation`. Checked against sesame (`docs/validation/V2_methylation.md`, K-026).
+
 ## 1.1.0 — 2026-09-28 (P9, P10)
 
 **Packaging (P10).** `scripts/build_dist.sh` (sdist, pure wheel, manylinux_2_28 kernel wheels for x86_64 and