render_excel(report): one worksheet per location — interval table, a line chart,
and a Last/Base/Δ summary per window. Metric-driven, so it tracks whatever metric
set is configured.
- orchestrator: render report.xlsx alongside report.html, attach it to the email
(dry-run until SMTP set), expose xlsx_path. Never lets a spreadsheet error sink
the report.
- reports router: /list includes xlsx_url when present; new
GET /archive/{date}/xlsx serves the saved spreadsheet.
- UI: Recent-reports rows get an "Excel" download link.
Verified: real Feb data -> valid .xlsx (sheet per NRL, interval table + chart +
summary with real values), attachment path runs, both archive routes registered.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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