Abstract
This synthesis paper unifies the six research papers of Volume III of the Toward RH\,:\,HoTT-Prop programme. Volume II answered ``what would it take to state the Riemann Hypothesis as a term in homotopy type theory?'', producing a precise six-gate roadmap and six open questions (OQ1--OQ6) at its boundary. Volume III addressed those six questions in parallel, one paper each. The honest result of the volume, in one sentence: it produced one cleanly engineered new theorem (Part I, OQ1: contractibility of the $(2k)$-streaming witness in the digit-stream final coalgebra) and five well-formulated op…
