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A Multica-managed run goes terminal the moment the top-level turn exits; there is no "background work finishes later and wakes you up" step. When an agent starts background work (a run_in_background shell, a Monitor, an async subagent) and ends its turn to "wait for a completion notification", the work is orphaned and the result comment it meant to post is never sent (MUL-4091 / PR #4970). The existing claude-only protocol guard forces run_in_background tool inputs to foreground and fails loud on async_launched tool results, but it cannot catch the actual MUL-4091 mechanism: a turn that ends cleanly with a "Standing by, I'll report when CI finishes" message. That shape is only addressable behaviorally, and it is harness-agnostic. Harden the Background Task Safety brief (both the legacy/verbose production path and the slim staging path) with explicit hard pins: - never background-and-yield / expect a future wakeup that does not exist here; - do every wait synchronously in a single foreground call (e.g. gh run watch); - the standalone-harness "running in the background, keep working" hint does not apply in Multica-managed runs; - never end a turn with a "standing by" / "I'll report back" sign-off. Add verbose- and slim-path test coverage for the new pins so a future brief trim cannot silently drop them. Co-authored-by: J <j@multica.ai> Co-authored-by: multica-agent <github@multica.ai>