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feat(PBI-78): cost-analysis data layer (T-902)

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- New lib/insights/cost-analysis.ts with 5 query functions:
  getCostKpi, getCostByDay, getCostByModel, getCostByKind, getCacheEfficiency
- Period type: 7d | 30d | 90d | mtd
- Cost formula reused from token-stats.ts (input + output + cache + thinking)
- Cache savings: cache_read_tokens × (input_price - cache_read_price) / 1M
- Plan: docs/plans/PBI-78-cost-analysis-widget.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Janpeter Visser 2026-05-10 12:48:02 +02:00
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@ -54,6 +54,7 @@ Auto-generated on 2026-05-10 from front-matter and headings.
| [M9 — Actief Product Backlog](./plans/M9-active-product-backlog.md) | active | 2026-05-03 |
| [PBI-11 — Mobile-shell met landscape-lock (settings + backlog + solo)](./plans/PBI-11-mobile-shell.md) | — | — |
| [PBI-75 — Sprint task-edit client-side via workspace-store](./plans/PBI-75-sprint-task-edit-store.md) | — | — |
| [PBI-78 — Cost-analyse widget op Insights-pagina](./plans/PBI-78-cost-analysis-widget.md) | — | — |
| [Queue-loop verplaatsen van Claude naar runner](./plans/queue-loop-extraction.md) | — | — |
| [Advies - SprintRun, PR en worktree lifecycle als state machines](./plans/sprint-pr-worktree-state-machines.md) | draft | 2026-05-06 |
| [ST-1109 — PBI krijgt een status (Ready / Blocked / Done)](./plans/ST-1109-pbi-status.md) | active | 2026-05-03 |