P4 validated on 2141 vendor GTCs; legacy AutoCall 1.6.2 preset

- vendor comparison (1000 Genomes Omni2.5, AutoCall 1.6.2.2): every
  computed field identical in 2138/2141 samples; the 3 others trace back
  to the single-locus raw-intensity rule (K-009); sex rule 1 matches all
- AutoCall 1.6.2.x leaves GC10/GC50/#calls/#no-calls at 0 in GTC v3:
  new `--preset autocall-1.6.2` (1.1.2 normalization, sex rule 1, GTC v3,
  legacy statistics); the sample summary keeps the real statistics
- NaN sign canonicalised to the x86 pattern (K-014); report P4.md

README.md

@@ -9,10 +9,10 @@ Personal research toolkit for Illumina Infinium genotyping BeadChip data
 
 ## Status
 
-Phases **P0 (setup)**, **P1 (file parsers)**, **P2 (canonical model, raw X/Y)** and **P3 (normalization)** are
-complete — see `docs/validation/`. Each is validated on 2141 vendor GTCs of the 1000 Genomes Omni2.5 set
-(normalization transforms bit-identical).
-Available commands: `simurg version`, `simurg inspect <files…> [--json]`, `simurg ingest`, `simurg normalize`.
+Phases **P0 (setup)**, **P1 (file parsers)**, **P2 (canonical model, raw X/Y)**, **P3 (normalization)** and **P4 (genotype
+calling, GTC output)** are complete — see `docs/validation/`. Each is validated on 2141 vendor GTCs of the 1000 Genomes Omni2.5 set
+(normalization bit-identical; genotypes/scores identical in 2138/2141 samples).
+Available commands: `simurg version`, `simurg inspect <files…> [--json]`, `simurg ingest`, `simurg normalize`, `simurg genotype`.
 
 ## Quick start