Bank a completed pour/add into the build buffer.
Reset the buffer (the terminal step clears it after minting).
Weakest-link grade across the banked contributions.
How the build was worked, or null if not yet stirred/shaken.
Summed measure of every contribution, in litres.
The recorded manual-step command sources, in order (snapshot-safe).
The contributions banked so far (snapshot-safe).
True iff nothing has been banked yet.
Record the verbatim command source of a completed manual step (the demonstration-capture trail). A scripted build records nothing (its dispatched commands carry no typed source), so only a hand-typed build accumulates a transcript — the natural manual-vs-scripted discriminator. Empty/blank sources are ignored.
Public method surface contributed by ManualBuildMixin.