ainb-fleetcostlisted

# ainb fleet:cost Fleet-shaped spend rollups. ainb already tracks `cost_usd` per provider call (the burndown plugin aggregates it); this verb reshapes that data into per-session / per-model / per-day / per-group USD totals joined to the live fleet, and evaluates configured budget caps. ## Run ```bash ainb fleet cost # text tables (default) ainb --format json fleet cost # JSON for piping ainb --format json fleet cost --period week # window: today|week|30days|month|all ``` `--format` is a **global** flag — it goes before `fleet`, not after `cost`. The `--period` window scopes the data (default `month`): burndown date-bounds its call set and re-aggregates, so a narrower period returns less spend; `all` reports lifetime totals. ## Output fields (JSON) | field | meaning | |---|---| | `totals` | fleet-wide `{cost_usd, bucket, session_count, model_count}` | | `sessions[]` | per-session `{session_id, provider, project, cwd?, group?, cost_usd, bucket}`, sorted by descending cost | | `models[]` | per-model `{model, cost_usd, bucket}`, sorted by descending cost | | `daily[]` | per-day `{date, cost_usd, bucket}` | | `groups[]` | per-workspace `{group, cost_usd, session_count, bucket}` (only sessions that match a live fleet cwd) | | `budget_breaches[]` | `{scope, subject, cwd?, cost_usd, limit_usd}` — caps crossed this run (also delivered to notifyd) | `bucket` is the token breakdown: `input_tokens`, `cache_creation_tokens`,