- Added usage snapshot persistence in sqlite with hour-bucket upsert behavior.
- Added listUsageHistory query support with optional provider and sinceMs filters.
- Added usage CLI history mode with `--history` and `--days` and trend rendering.
- Added changelog documentation for usage trend inspection and no-history exit behavior.
- Updated usage-window reporting to track remaining account quota instead of required-account counts.
- Replaced the computed "needed" metric with a non-negative remaining-quota value derived from each window's total minus used fraction.
- Changed usage output lines from "need" to "capacity" and now show used/total accounts with remaining quota multiplier.
- Added per-account usage reporting in the `omp usage` command.
- Added `provider`, `json`, and `redact` options to customize usage output.
- Updated CLI wiring to route usage commands to the new per-account behavior.
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