Preserve free live-executor waiting before ordinary managed model recovery.
Configured-session supervisors use the same upstream-observation path as
other managed tasks; external start and patch custody guards stay in place.
Negotiate private response evidence and preserve known terminal usage when
local message normalization fails, without introducing another retry owner.
Keep unknown accounting and exact source custody explicit (P1), repair the
shared recovery boundary (P2), and reuse existing transport/result owners
(P7). Update coupled tests and architecture/development descriptions.
