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Review-caught coverage gap: the existing Subtype_Change test runs the POSITIONAL path (id-less payload). Add a handler-level test for the id-mode branch — one id-matched item changes subtype (One->Duration: delete+insert, new id) while a sibling id-matched item keeps its subtype (Multiple: in place, id + fill-group state preserved) in the same payload. Proves the delete pass + match-pass Remove/Add don't double-handle and the survivor's state is retained. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>