Move the structural clone from the four call sites (auto review, codex
runtime, CLI /refine, gateway /refine) into AIAgent._spawn_background_review,
which every review path — immediate, idle-queue deferred, requeued — passes
through. Callers can no longer forget it, and the private helper is no longer
imported across hermes_cli/ and gateway/ package boundaries.
Tests now bind the real chokepoint (capturing at _spawn_background_review_now)
so they still fail if the clone is removed.
Widen #100802 to the two explicit review entry points. The CLI and gateway
/refine handlers built their own snapshot with a shallow list(), which
aliases the nested tool_calls/content containers of the live history. The
review fork sanitizes its transcript in place (sanitize_tool_call_arguments
rewrites function["arguments"]), so a /refine could rewrite the parent's
persisted transcript exactly like the automatic review could (#100795).
Both sites now use _clone_background_review_messages, the same structural
clone the automatic review uses. Regression tests drive the real handlers
and assert the snapshot shares no containers with the live transcript.
kshitijk4poor