Under the hood
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A new attachment records full deferred tool schemas and name-only announcements, diffed so only changes are re-emitted.
A new deferred_tools_record attachment type now also records full tool input schemas (toolEntries) and name-only announcements (nameOnlyAnnouncements) alongside the existing per-turn deferred tool descriptions. These are diffed turn-over-turn so only new or changed entries are re-emitted.