"""
NXOpen script — Build Interface Model (Model A) for Assembly FEM.

ONE-TIME: Creates spider elements (RBE2/RBE3) at each hole + edge BC nodes.
Exports interface_nodes.json for the iteration script.

NOTE: Skeleton — requires NX environment for development.
See docs/technical-spec.md Section 4.2 for full pseudocode.
"""


def build_interface_model(geometry_json_path, fem_part):
    """
    Build Model A: spider elements at each hole + edge BC nodes.
    
    For each hole:
    - Center node (master)
    - N circumference nodes (~1 per 2mm of circumference)
    - RBE2 (rigid) or RBE3 (distributing) spider
    
    For plate boundary:
    - Edge nodes at ~3mm spacing
    
    Exports interface_nodes.json with all node IDs and coordinates.
    """
    raise NotImplementedError(
        "Develop inside NX Simcenter. See docs/technical-spec.md Section 4.2."
    )