Why: preserve the failed A01 outcome and an actionable design for reliable staged material work. Evidence: Documents links and diff checks pass; Dev make test passed with the staged Documents gitlink; original A01 and offline diagnostic receipts remain SELF. Impact: documentation, task-card evidence and Documents pin only; no product behavior or model budget change. Refs: modules/documents/docs/proposals/2026-10-14-fast-slow-u3-r04-reliable-first-checkpoint-design.md; .task/feature-fast-slow-u2-u3-plan.md
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