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8431dbead3
A removed session can no longer be the delivery owner of its continuable children, but the `host/session-removed` handler only reconciled the removed row's own activity. `parentAvailable` was updated exclusively from `refreshSubagents` success, and removal schedules no catalog refresh — so after the parent's Activation detaches, an addressed child kept a writable editor against a dead continuation owner until an unrelated refresh (or forever, for a closed menu). Flip `parentAvailable` to false on the owned catalog and push `handleSubagentParentAvailable(false)` to every addressed child Session at removal time, matching the refresh path's notification. New Session instances already read `parentAvailable` from the catalog, so they inherit the invalidated state. Adds a regression test: removing the catalog's owning parent flips the snapshot's `parentAvailable` and notifies the addressed child instance.