1.1.0

feat(usage): add collect_upcoming_resets helper

Flatten all account metrics across provider groups whose resetAt falls in
the future window (now, now+horizon], sorted ascending by resetAt.
Percent uses per-metric used/limit clamped 0-100 (ratio displayStyle also
reports percent), no cross-metric aggregation. now is injected for testing.

Co-Authored-By: Claude <noreply@anthropic.com>