feat: TrialConfinement — a call confined to a disposable workspace composes mutation as Ephemeral - #37
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…mposes mutation as Ephemeral A third producer beside declared descents and the authority policy: a live confinement fact on CallSubject (workspace id, arguments digest, the bounds the runner IMPOSED, why). composeForCall() consults it after declared descents and lowers mutation to Ephemeral — what the call writes dies with the workspace — and NOTHING else: a copy isolates files, not the world, so externality, authority, reversibility and subject stay exactly as declared (greenhouse decisions/0068: zero descent on third_party). Like every producer it only lowers: an operation already at Ephemeral or None gets no reduction. ProfileComposition::confinedByTrial() is the one fact a policy reads to know a call is confined — from the reductions, never from the effective profile alone (a temp-file op is also Ephemeral and confined to nothing). Greenhouse decisions/0069.
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A third producer beside declared descents and the authority policy: a live confinement fact on
CallSubject(workspace id, arguments digest, the bounds the runner IMPOSED, why).composeForCall()consults it after declared descents and lowersmutationtoEphemeral— what the call writes dies with the workspace — and nothing else: a copy isolates files, not the world, so externality, authority, reversibility and subject stay exactly as declared (greenhousedecisions/0068: zero descent onthird_party). Like every producer it only lowers.ProfileComposition::confinedByTrial()is the one fact a policy reads to know a call is confined — from the reductions, never from the effective profile alone.First piece of the trial slice (greenhouse
decisions/0069). Ships as command 0.18.0.