feature/base-ext-admin-project
main
EXT-18: optional AdminProvider interface (IsAdmin) + Request.HostProjectID for trusted project context. Implements RDM U1 base extension request. 4 tests + surface snapshot.
Refs: RDM docs/proposals U1 base extension requests; KTD4/KTD5
Why: RDM KTD4 dual-layer admin requires base isAdmin visibility (superuser slot); KTD5 host-project binding needs trusted current-project context. Evidence: SELF 4 ext18 tests pass + surface snapshot regenerated + full pkg/extension + internal/app suites green. Impact: extension.Request gains HostProjectID; optional AdminProvider interface (EXT-17 pattern); inprocHost implements IsAdmin via GetUserAuthState; three dispatch sites set HostProjectID from conversation. Refs: RDM docs/proposals U1 base extension requests
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EXT-18: optional AdminProvider interface (IsAdmin) + Request.HostProjectID for trusted project context. Implements RDM U1 base extension request. 4 tests + surface snapshot.
Refs: RDM docs/proposals U1 base extension requests; KTD4/KTD5