The SDK subagent provider now uses session/wait to keep a delegated child
runtime alive through nested work. A deployment that explicitly selects an
older dshBin can still initialize and accept a prompt but cannot satisfy
that completion request; it must report an execution failure rather than
silently treating the first idle as success.
State the required operation in the provider's owning failure/recovery
contract and update the current activation upgrade guide to tell users to
upgrade a separately configured runtime with the provider. This adds no
capability negotiation, compatibility fallback, or new runtime behavior.
Validation: upgrade-guide structure/word budget and both bilingual pairs
pass. The requirement matches the provider's direct session/wait request
and the SDK server's explicit unknown-method rejection.
Tianyi Cui
d49efe8b0f