Why: establish the authorized task workspace and its initial baseline.
Evidence: preserved precheck receipt in .task/feature-rdm-u4-closeout.md; R0=c0e123b35eeb61ee45d268a7c597b7e844f0d222.
Impact: task metadata only; the feature workspace starts at c0e123b35e.
Refs: .task/feature-rdm-u4-closeout.md
Why: include the current integration baseline before verification.
Evidence: fetched origin/main=97002721485662c1e2abfa793f63d46f12cb14ce.
Impact: integrate upstream changes without rewriting task history.
Refs: task-sync
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U4 closeout: docs gitlink -> Documents PR #73 merge 63d5986. PROJECT.md entry updated. Task card feature-rdm-u4-closeout. Docs+pin only. Refs: Documents #73; Dev #368/#373.