Effection context holding the scratchpad fork parent branch
Set by withSharedRoot to the current root branch. Tools that
need scratchpad extraction (e.g. BufferingFetchPage, BufferingWebSearch)
read this via yield* ScratchpadParent.expect() to fork from the
innermost active root — never a stale reference from a prior scope.
Effection context holding the scratchpad fork parent branch
Set by withSharedRoot to the current root branch. Tools that need scratchpad extraction (e.g. BufferingFetchPage, BufferingWebSearch) read this via
yield* ScratchpadParent.expect()to fork from the innermost active root — never a stale reference from a prior scope.