Why: establish the authorized task workspace and its initial baseline.
Evidence: preserved precheck receipt in .task/feature-base-ext-admin-project.md; R0=b5f766a9ae59c9c67752a9c4b17f41ac21c7ebeb.
Impact: task metadata only; the feature workspace starts at b5f766a9ae.
Refs: .task/feature-base-ext-admin-project.md
Why: include the current integration baseline before verification.
Evidence: fetched origin/main=555fb2162fe47e13835c592013bc3a69e46239e2.
Impact: integrate upstream changes without rewriting task history.
Refs: task-sync
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EXT-18: backend AdminProvider (IsAdmin) + Request.HostProjectID. Backend PR #158 merge 1fa03a3. RDM side in PR #220.
Refs: Backend #158; RDM #220; KTD4/KTD5