003b540481
Remove the per-duration VAM curve everywhere (metrics, summaries, detail JSON, athlete.json, VamChart.svelte, AthleteView VAM tab). Keep only climbing_vam_mh per activity. Add it to activity summaries so NerdCorner can plot average climbing VAM per week/month year-over-year alongside distance/elevation/time. Add --backfill-vam-summary flag to copy the field from existing detail JSONs into index.json without re-extracting.