docs(design): resolve wrap-up routing spec decisions (Reading B)

All six decisions resolved. The router's input is filed keepers that belong to another project, not raw inbox files (Reading B). That keeps it a separate sub-step from the inbox gate (D1) and distinct from the defer-and-stage router (D5). Transcript routing is deferred to vNext (D4).

I reworked the design to match: the input definition, a candidate-set note bounding the router to session-filed keepers rather than the standing backlog, and Phase 3. The cookie reads [6/6] and the Status moved to ready for review.

The A-vs-B input ambiguity was the root under D1 and D5. Reading B keeps the inbox gate, the router, and defer-and-stage each simple instead of entangling all three.

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