AH delta - stacked lines by hour of day

AH delta (g/m3 gained/lost per hour) by hour-of-day, one subplot per shed line (line 5, closest to Puerta N, on top; line 1, closest to Puerta S, on bottom), one series per position within that line. Line 5 shows only pos 1 — 5-2/5-3 are excluded (dead sensors, see findings.md #10). X-axis (hour of day) is shared across all 5 rows.