Prototype (f): exportable carbon and cost report

Branch proto/carbon-report. One line: before running an analysis, estimate its energy, CO2 and cost for one or more places, and keep the estimate as a report (print/PDF, CSV, JSON) with a SHA-256 so the kept file can be checked later.

• /carbon-report, /ja/carbon-report. No wallet, no job, no payment.
• Example: the same OCR workload (40 jobs × 30 min) in Stockholm, Tokyo, Calgary and Kashiwa (mdx). Stockholm 14.0 gCO2e vs Calgary 2.84 kgCO2e (~203×). mdx shows "cannot be established" (power not measured) and is not ranked.
• "Alternatives" (default) compares lowest/highest; turning it off adds lines up. Lines that cannot be estimated are left out of totals, never counted as zero.
• Every value keeps its label (measured / provider-reported / portal-estimated / cannot be established) and its source; assumptions and limits are printed.
• Uses the existing computeFootprint registry (commit fe33bc82). Added English versions of the source notes so the English report has no Japanese notes.
• Text in content/carbonReport(.ja).json; model and exports in src/@utils/carbonReport.ts (tests: carbonReport.test.ts).

Files: report-en-compare.png, report-en-combined.png, print-ja-page1.png, page-en-full.png, sample-report-en.pdf, sample-ja.csv.

Open points: the figures assume the same run time on every machine (different GPUs); OCR throughput itself is not measured. Registry values are from 2026-08.

Source: docs/prototypes/carbon-report/

Screenshots

page-en-full.png

print-ja-page1.png

report-en-combined.png

report-en-compare.png