* docs(program): adopt class-ready Pro-dev cutover track
Stop blocking range readiness on unfinished Phase 3–6 contracts; document a companion Pro-dev stack that preserves Community independence.
* docs(program): reframe class-ready cut as private build root
Success is sirius-pro as the sole mutable Compose/build root on the range
with locked Community digests on :3000/:9001; companion sidecars alone do not
satisfy the cutoff.
Matthew Toussain
33f8915089