Harmonize Docs

Treat the repository's documentation as one system. Replace sediment with a coherent account of present reality and future intent: each durable fact has one canonical home, current implementation and target design remain visibly distinct, each active plan reflects reality and remaining intent, and the documents route readers without contradiction.

Use a light pruning bias: when alternatives preserve the same durable reader value, prefer the leaner one. Treat concise, well-scoped documents as already at their natural depth. Preserve or add detail when it materially improves understanding, rationale, operational safety, or future decisions.

Scope contract