- A 열 is one row across the footing width; each has its own count along the
length. Default floor((L − 1400) / 2250) + 1 per 열, as in spec §4.6.
- Counts are validated: one per 열, whole numbers 2–30. Spacing below the
2250 mm minimum is shown as a warning, not refused (the plan's 6본 → 5@1800
example).
- PierInput gains an optional pileRows; absent means the defaults, so existing
files and the P1 results are unchanged.
- Change tracking compares arrays by value; 열별 본수 can be reverted and
copied (copy item off by default).
- The footing card has −/+ per 열 with spacing, total, and the display string.
- Tests: defaults 4열 × 5본 = 20 and the 1단계 text; 6본 → 5@1800; limits;
model-level 21 piles.
- Not verified in a browser.
Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
