docs(design): draft wrap-up routing spec

A spec for the optional wrap-up step that routes inbox items (and, vNext, transcripts) to the project they belong to. Three decisions settled from grounding (reuse todo-cleanup's Open Work matcher as the destination anchor, move atomically through one helper, keep cross-project writes visible with a provenance note); three left open for Craig (separate router step vs merged into the inbox sanity check, transcript scope and trigger, reconciling with the defer-and-stage router). Five implementation phases, acceptance criteria, readiness dimensions.

Status stays draft while decisions are open. The todo task moves to DOING and links the spec.

From the archsetup handoff 2026-06-13.

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