COSG v1.0.0 - Seurat v3/v4/v5 Compatible

COSG 1.0.0

Full compatibility with Seurat v3, v4, and v5 (including SeuratObject 5.3.0+).

What's New

Seurat v5 support — Fixes the slot argument defunct error on SeuratObject ≥ 5.3.0 ([#5](#5))

• New layer parameter for Seurat v5 users: cosg(obj, layer='data')
• The slot parameter is kept for backward compatibility with Seurat v3/v4
• Automatic JoinLayers() for split multi-layer assays (common after merge() in Seurat v5)
• Automatic sparse matrix conversion for SCT and other dense assays

Lighter dependency footprint

• Moved Seurat from Imports to Suggests
• Now depends on SeuratObject (>= 3.0.0) — works across all versions