content(blog): deepen "What If Your Inputs Could Vouch for You?" for technical readers

Rewrite the input-biometrics post in the current house voice (em-dash-free,
declarative, cross-linked) and add real engineering substance for in-depth
onlookers: kinematics/submovement/Fitts features, 8-12Hz tremor via PSD,
ex-Gaussian reaction-time fits, KS/Wasserstein anomaly scoring, input-vs-
game-state correlation, and an honestly-caveated adversarial section.
Regenerated blog-seed.ts. …