Development record

Every repository abcd manages should carry an enforced single-source-of-truth rule: each fact has one canonical home, and every other place it appears is generated from that home and checked, never hand-copied. Today abcd holds pieces of this for itself (the Markdown-is-the-source rule in the bundled documentation domain, its own one-canonical-primitive principle, generated blocks with drift checks), but a managed repository gets no stated rule and no gate that catches a hand-edited copy drifting from its source.