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+usc W-jarvis self-sweep material delta: new mosaicstack/stack PR #870 is open/mergeable against main at exact head c64a04e7dd086910bf4b14315b6c860b9c7c6f49. Provider-visible reviews=0; exact-head CI is pending/unregistered after bounded 30s wait; body says only 'Part of #869 (Point-1 C1)' and has no Closes/Fixes/Resolves linkage. NO MERGE. Fleet ownership unchanged (13 managed/13 unique; unmanaged coder2-4 untouched; protected dead issue865-terra untouched). Please route to owning lead for exact-head RoR, CI, and linkage disposition.