Multi-agent claims live in-tree under `.abcd/coordination/` per the universal patterns, but in the machine-scoped run store per the implement chapter

Multi-agent claims live in-tree under .abcd/coordination/ per the universal patterns, but in the machine-scoped run store per the implement chapter

A scope leakage (severity minor) found by the cross-document consistency pass.

• End A: .abcd/development/brief/05-internals/04-universal-patterns.md:139 — "Coordination state (file locks like shape.lock, multi-agent claims per itd-33) lives at .abcd/coordination/"
• End B: .abcd/development/brief/04-surfaces/27-implement.md:3 — "It holds a run's shared state in the machine-scoped store, records the sessions that join it, makes a record the unit of exclusion between them with a claim"

04-universal-patterns places multi-agent claims (itd-33) under .abcd/coordination/, beside a committed coordination append-log with daily UTC rotation. 27-implement keeps the claim that makes a record the unit of exclusion between concurrent sessions in the machine-scoped store, with its own per-UTC-day run log, and has the sessions write no repository file. Both documents claim the same ground, the exclusion record between concurrent agents, and give it incompatible homes.

Evidence: .abcd/work/reviews/2026-10-26-consistency/00-summary.md, finding 686.