The finale closes the exact-to-practical arc. Toy mechanisms were exact; real-scale trained values are outside hand enumeration.
highlighted = computed this step
What the track showed
The track showed mechanisms exactly on toys: regression, updates, attention structure, backprop, convolution, regularization, and finite tables of counts.
toy mechanisms, exact arithmetic
What it did not show
It did not recompute a real model by hand. It did not claim the toy nets scale into real trained values by inspection.
real trained values are not hand-enumerated
The honest close
This capstone names the boundary: parameter counts are exact integers, but scale blocks hand enumeration of real trained values. The toy examples are NOT learning, NOT generalization, and NOT a real-scale model claim.