Release 2.0.0: v2 modules (ArrayTrain, CN/LOH, PGx, methylation QC)

User guide: ArrayTrain section, v2 commands in the table, v2 accuracy rows,
updated limitations. README status for v2.0.0. Version 2.0.0 (Python package);
the Rust kernels are unchanged and stay simurg_core 1.1.0. uv.lock committed
(uv lock --check clean).

Full suite on the Pi, file by file under the memory guard: 29 files exit 0
(unit: 282 passed), ruff and mypy clean.

CHANGELOG.md

@@ -1,6 +1,8 @@
 # Changelog
 
-## Unreleased (v2)
+## 2.0.0 — 2026-09-30 (v2 modules)
+
+The Python package is 2.0.0. The optional Rust kernels are unchanged and stay `simurg_core` 1.1.0.
 
 **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,