Why: establish the authorized task workspace and its initial baseline.
Evidence: preserved precheck receipt in .task/feature-rdm-u3-closeout.md; R0=2e43e71209384b356ebfe664e9f27492fd514977.
Impact: task metadata only; the feature workspace starts at 2e43e71209.
Refs: .task/feature-rdm-u3-closeout.md
Why: include the current integration baseline before verification.
Evidence: fetched origin/main=259270b4e339132219490b95b42d12386f9abe1e.
Impact: integrate upstream changes without rewriting task history.
Refs: task-sync
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U3 closeout: docs gitlink -> Documents PR #69 merge 74e4163 (U3 progress in plan status/INDEX). PROJECT.md entry updated. Task card feature-rdm-u3-closeout. Docs+pin only; CI (GATE) on HEAD. Refs: Documents #69; RDM #201/#202.