feat: add adaptive isogrid tool — project foundations

- Python Brain: density field, constrained Delaunay triangulation,
  pocket profiles, profile assembly, validation modules
- NX Hands: skeleton scripts for geometry extraction, AFEM setup,
  per-iteration solve (require NX environment to develop)
- Atomizer integration: 15-param space definition, objective function
- Technical spec, README, sample test geometry, requirements.txt
- Architecture: Python Brain + NX Hands + Atomizer Manager

tools/adaptive-isogrid/src/atomizer_study.py

@@ -0,0 +1,48 @@
+"""
+Atomizer/Optuna integration for adaptive isogrid optimization.
+
+Wires: parameter sampling → Python Brain → NX Hands → result extraction.
+"""
+
+# Parameter space definition
+PARAM_SPACE = {
+    # Density field
+    'eta_0':  {'type': 'float', 'low': 0.0,  'high': 0.4,   'desc': 'Baseline density offset'},
+    'alpha':  {'type': 'float', 'low': 0.3,  'high': 2.0,   'desc': 'Hole influence scale'},
+    'R_0':    {'type': 'float', 'low': 10.0, 'high': 100.0, 'desc': 'Base influence radius (mm)'},
+    'kappa':  {'type': 'float', 'low': 0.0,  'high': 3.0,   'desc': 'Weight-to-radius coupling'},
+    'p':      {'type': 'float', 'low': 1.0,  'high': 4.0,   'desc': 'Decay exponent'},
+    'beta':   {'type': 'float', 'low': 0.0,  'high': 1.0,   'desc': 'Edge influence scale'},
+    'R_edge': {'type': 'float', 'low': 5.0,  'high': 40.0,  'desc': 'Edge influence radius (mm)'},
+    # Spacing
+    's_min':  {'type': 'float', 'low': 8.0,  'high': 20.0,  'desc': 'Min cell size (mm)'},
+    's_max':  {'type': 'float', 'low': 25.0, 'high': 60.0,  'desc': 'Max cell size (mm)'},
+    # Rib thickness
+    't_min':  {'type': 'float', 'low': 2.0,  'high': 4.0,   'desc': 'Min rib thickness (mm)'},
+    't_0':    {'type': 'float', 'low': 2.0,  'high': 6.0,   'desc': 'Nominal rib thickness (mm)'},
+    'gamma':  {'type': 'float', 'low': 0.0,  'high': 3.0,   'desc': 'Density-thickness coupling'},
+    # Manufacturing
+    'w_frame': {'type': 'float', 'low': 3.0,  'high': 20.0, 'desc': 'Perimeter frame width (mm)'},
+    'r_f':     {'type': 'float', 'low': 0.5,  'high': 3.0,  'desc': 'Pocket fillet radius (mm)'},
+    'd_keep':  {'type': 'float', 'low': 1.0,  'high': 3.0,  'desc': 'Hole keepout multiplier (× diameter)'},
+}
+
+# Default parameters for standalone brain testing
+DEFAULT_PARAMS = {
+    'eta_0': 0.1,
+    'alpha': 1.0,
+    'R_0': 30.0,
+    'kappa': 1.0,
+    'p': 2.0,
+    'beta': 0.3,
+    'R_edge': 15.0,
+    's_min': 12.0,
+    's_max': 35.0,
+    't_min': 2.5,
+    't_0': 3.0,
+    'gamma': 1.0,
+    'w_frame': 8.0,
+    'r_f': 1.5,
+    'd_keep': 1.5,
+    'min_pocket_radius': 1.5,
+}