Bug: Incorrect projections when `num_dirs` equals embedding dimension

[raphaelreinauer]

In src/ect/ect.py:140:

H = X @ V if V.shape[0] == X.shape[1] else X @ V.T

the shape heuristic fails when num_dirs == dim, e.g.,

from ect import EmbeddedComplex
from ect.directions import Directions
import numpy as np

G = EmbeddedComplex()
G.add_node('a', [0.0, 0.0])
G.add_node('b', [1.0, 0.0])
G.add_node('c', [0.5, 0.8])

directions = Directions(num_dirs=2, dim=2)
V = directions.vectors
X = G.coord_matrix

H_current = X @ V if V.shape[0] == X.shape[1] else X @ V.T
H_correct = X @ V.T  # matches _compute_simplex_projections (line 157)

print(np.allclose(H_current, H_correct))  # False

Part of this JOSS review.