Six fundamental equations for the constant congruence speed in any numeral system

One-page note summarizing six central equations describing the constant congruence speed of integer tetration bases in arbitrary numeral systems $r > 1$. These formulas compactly condense the fundamental results established in the referenced works, including the complete characterization for prime radices, the explicit cases $r =6$ and $r = 10$, and several general constructions valid for all squarefree $r > 2$. The note serves as a concise reference for the main properties and behaviors of (constant) congruence speed across different numeral systems.