automaton/tasks/complete/add-claim-loop-task/DOC_REVIEW.md

Doc Review: add-claim-loop-task

Documentation updated:

• CHANGELOG.md — added entry under [unreleased]
• design/loops/technical.md §7 — tick flow includes step 3.5 (claim) and step 9.5 (release); lock serialization §6 updated with claim subprocess bypass pattern
• design/loops/functional.md §12 — new section on cross-loop task claim