v0.1-sprint0: Esqueleto completo AR-ShipDesign

- Estructura completa de carpetas (236 módulos stub + implementados)
- pyproject.toml, requirements, .gitignore, LICENSE (propietario)
- core/project.py: serialización .arsd (ZIP con JSON)
- core/units.py: conversiones SI <-> imperial completas
- ui/main_window.py: layout DELFTship-style con todos los paneles
  - Árbol de proyecto (dock izquierda)
  - Tabs de módulos (centro)
  - Panel de propiedades (dock derecha)
  - Panel hidrostáticos en vivo (inferior, fijo)
- ui/i18n: español e inglés
- ui/themes: tema claro y oscuro
- utils/logger.py, settings.py, validation.py
- data/liquids.json: 15 líquidos navales
- data/stability_criteria.json: IMO IS Code 2008, A.749(18), USCG
- tests/test_startup.py: 12 tests, todos PASSED
- Módulo scantling/ ISO 12215 (stubs Sprint 2.5)
- Módulo fabrication/molds/ para moldes FRP (stubs Sprint 13B)
- Módulo fabrication/ para CNC plasma/router/laser (stubs Sprint 13)

data/benchmarks/README.md

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+# Cascos de validacion
+
+Archivos de referencia para validar los modulos de calculo.

data/liquids.json

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+{
+  "HFO":  {"name": "Heavy Fuel Oil",        "density_kg_m3": 991,  "viscosity_cSt": 380,  "color": "#3d2b1f"},
+  "MGO":  {"name": "Marine Gas Oil",        "density_kg_m3": 890,  "viscosity_cSt": 6,    "color": "#c8a96e"},
+  "MDO":  {"name": "Marine Diesel Oil",     "density_kg_m3": 870,  "viscosity_cSt": 11,   "color": "#b8953a"},
+  "LSFO": {"name": "Low Sulphur Fuel Oil",  "density_kg_m3": 985,  "viscosity_cSt": 180,  "color": "#4a3728"},
+  "LO":   {"name": "Lubricating Oil",       "density_kg_m3": 920,  "viscosity_cSt": 100,  "color": "#8b6914"},
+  "HO":   {"name": "Hydraulic Oil",         "density_kg_m3": 875,  "viscosity_cSt": 46,   "color": "#d4a017"},
+  "FW":   {"name": "Fresh Water",           "density_kg_m3": 1000, "viscosity_cSt": 1.0,  "color": "#4fc3f7"},
+  "SW":   {"name": "Sea Water (ballast)",   "density_kg_m3": 1025, "viscosity_cSt": 1.05, "color": "#0277bd"},
+  "DW":   {"name": "Distilled Water",       "density_kg_m3": 999,  "viscosity_cSt": 1.0,  "color": "#b3e5fc"},
+  "SLP":  {"name": "Slop / Bilge",          "density_kg_m3": 1010, "viscosity_cSt": 5,    "color": "#5d4037"},
+  "SEW":  {"name": "Sewage",                "density_kg_m3": 1010, "viscosity_cSt": 3,    "color": "#6d4c41"},
+  "URE":  {"name": "Urea 40% (SCR/AdBlue)", "density_kg_m3": 1090, "viscosity_cSt": 1.4,  "color": "#e1f5fe"},
+  "LNG":  {"name": "LNG (gas natural lic.)", "density_kg_m3": 450,  "viscosity_cSt": 0.2,  "color": "#e8f5e9"},
+  "MeOH": {"name": "Methanol",              "density_kg_m3": 791,  "viscosity_cSt": 0.74, "color": "#f3e5f5"},
+  "NH3":  {"name": "Ammonia (liquid)",      "density_kg_m3": 682,  "viscosity_cSt": 0.27, "color": "#fff9c4"}
+}

data/stability_criteria.json

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+{
+  "IMO_IS_Code_2008": {
+    "name": "IMO IS Code 2008 (MSC.267(85))",
+    "description": "Código Internacional de Estabilidad en Condición Intacta 2008",
+    "criteria": {
+      "area_0_30": {"min": 0.055, "unit": "m·rad", "description": "Área bajo curva GZ de 0° a 30°"},
+      "area_0_40": {"min": 0.090, "unit": "m·rad", "description": "Área bajo curva GZ de 0° a 40°"},
+      "area_30_40": {"min": 0.030, "unit": "m·rad", "description": "Área bajo curva GZ de 30° a 40°"},
+      "gz_at_30": {"min": 0.200, "unit": "m", "description": "GZ mínimo a 30° de escora"},
+      "angle_gz_max": {"min": 25.0, "unit": "grados", "description": "Ángulo de GZ máximo ≥ 25°"},
+      "gmt_initial": {"min": 0.150, "unit": "m", "description": "Altura metacéntrica inicial GM_T ≥ 0.15 m"}
+    }
+  },
+  "IMO_Weather_A749": {
+    "name": "Criterio Meteorológico IMO A.749(18)",
+    "description": "Resolución A.749(18) — Criterio de resistencia al viento y al balance",
+    "criteria": {
+      "weather_ratio": {"min": 1.0, "unit": "adimensional", "description": "b/a ≥ 1.0 donde a=área escorante, b=área adrizante"}
+    }
+  },
+  "USCG": {
+    "name": "USCG Stability Criteria",
+    "description": "United States Coast Guard — embarcaciones de recreo",
+    "criteria": {
+      "gmt_initial": {"min": 0.100, "unit": "m", "description": "GM_T ≥ 0.10 m"},
+      "range_stability": {"min": 60.0, "unit": "grados", "description": "Rango de estabilidad positiva ≥ 60°"}
+    }
+  }
+}