Break the bus work down, measured, in dependency order

Counting the surface first changed the plan twice: the genesis bed cannot run until the links exist, so it belongs to step 4, and there is no conformance suite to recapture — step 3 builds one against the current bus before moving it. Both corrections are recorded in the breakdown rather than edited into ADR 0115. Also indexes design 25, which was never listed.
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@@ -307,6 +307,9 @@ when its retirement condition holds. The bus's port settings follow ADR 0100 lik
 What is not done, at any step: no dual-bus period for the mesh's own traffic, no bridge, no module
 rebuilt.

+**The work of these five, broken down and measured, is [design 28](28-building-the-bus.md)** —
+including the two places their dependencies put a bed later than the step that names it.
+
 ## 10. How it is checked

 **A bed per step, and each is green before the step after it starts** — the division in §9 is only