Add CAOS Organizer CNC project notes

cnc/README.md

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+# CNC Project\n\nDesigns and CAD work for CNC milling projects.\n

cnc/caos_organizer.md

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+# CAOS Organizer
+
+CNC parametric grid organizer for small parts.
+
+## Parameters (from FreeCAD Spreadsheet)
+
+| Variable | Value | Description |
+|----------|-------|-------------|
+| width_mm | 800 | Total width (mm) |
+| height_mm | 600 | Total height (mm) |
+| depth_mm | 200 | Total depth (mm) |
+| n_w | 5 | Compartments in width |
+| n_h | 3 | Compartments in height |
+| cell_w | 160 | Cell width (mm) |
+| cell_h | 200 | Cell height (mm) |
+
+## Design
+
+- Main grid: 5 cols × 3 rows = 15 primary compartments
+- Bottom row: Each column subdivided into 3 sub-compartments
+- Total sub-cells in bottom row: 15
+- Material thickness: To be determined
+
+## Files
+
+- FreeCAD file: `caos_organizer.FCStd`
+- Location: `/home/claudio/FreeCAD/`