A flow restored via Flow.from_pending() is a fresh instance whose
_flow_match_id starts at None. When resume_async then attaches the
LLMCallCompletedEvent listener, the handler filter
(current_flow_id.get() != flow._flow_match_id) either absorbs
unrelated events (when the contextvar is also None) or skips the
flow's own LLM calls (when set to a different id).
Seed instance._flow_match_id = instance.flow_id at the end of
from_pending so the resume-phase aggregator has a real id to match
against. The accumulator itself stays at zero on restore — any
usage from before the pause was only observable on the original
kickoff instance.
Add an end-to-end test that pauses a flow, restores it via
from_pending, emits one of its own LLM events and one belonging
to a sibling flow during resume, and asserts only its own is
counted.
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