`tool.generating` names the tool whose arguments are streaming, and nothing
ever closed that claim: there is no stop-drafting event, and a draft can be
abandoned without reaching `tool.start` when a mid-stream retry drops a
partial call or a guardrail blocks the tool. Enumerating the ways a draft
ends left those holes open, so "Editing" sat under the transcript for the
rest of a multi-iteration turn.
Invert the rule — the claim only covers what the model is emitting right
now, so any other output from that session retires it. Stopping the turn
clears it too, and a `tool.generating` that arrives after the stop is
ignored on the same condition `mutateStream` already drops late tool rows.
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