weichen
a74318ab4b
Why: preserve the approved design decision and a staged, verifiable plan before code work. Evidence: six tasks and thirty steps self-reviewed; local links pass; make test passed with Documents 276f885 staged, receipt imported as SELF. Impact: documentation, task card and Documents gitlink only; no model calls or production behavior changes. Refs: modules/documents/docs/proposals/2026-10-14-fast-slow-u3-r04-reliable-first-checkpoint-implementation-plan.md; .task/feature-fast-slow-u2-u3-plan.md
ui
@ ac5b617e9e