Why:
Later authenticated source acquisition must never follow a frontend build or provider test.
Evidence:
SELF host replay passed all 23 real composition fixtures; both acquisition-order regressions failed before the repair.
Impact:
Prepare fixed sources and Go/npm caches before execution; retain committed tooling checks and RDM-selected Backend versions.
Refs:
R7, R8, R11, R14; dependency-workspace U5