feat: dump standard-section variable table as coordinate grid (Task 4)

Table 1 (R1..R3', phi1/phi2) and table 2 (A..K, 라이닝 두께 300) are parsed by
S(%) rows +3..-3. R1=6982, R3'=4699, R2'=3910 match the arc list; lining
thickness 300 mm matches the concrete arc band. Units of a..f and the
cross-slope station ranges need HITL confirmation.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A5Cun3RHQKna9qxE6ybZ4A

data/std_section_table_grid.csv

@@ -0,0 +1,36 @@
+27400,표준 단면도
+24350,표준단면 적용구간
+23550,"대     산     1    ,    2     터     널"
+23000,구   분,편  경  사,적  용  구  간 ( 개 착 구 간 제 외 )
+22550,대산방향,-2%%%,STA.3+070.00 ~ 3+555.00
+22200,대산 1터널,-2%%% ~ +3%%%,STA.3+070.00 ~ 3+145.00
+22000,당진방향
+21850,+3%%%,STA.3+145.00 ~ 3+565.00
+21500,+2%%%,STA.4+740.85 ~ 5+075.00
+21150,대산방향,+2%%% ~ -2%%%,STA.5+075.00 ~ 5+135.00
+20800,-2%%%,STA.5+135.00 ~ 5+476.31
+20600,대산 2터널
+20450,-2%%%,STA.4+745.00 ~ 5+105.00
+20100,-2%%% ~ +2%%%,STA.5+105.00 ~ 5+165.00
+19900,당진방향
+19750,+2%%%,STA.5+165.00 ~ 5+480.00
+18650,"상세 ""A""","상세 ""B"""
+11500,치  수  표
+10850,치  수  표
+10400,S
+10300,a,b,c,d,e,f,R1,R2,R3,R2',R3',φ1,φ2,φ1',φ2'
+10200,(%)
+9850,NOTE
+9750,+3,2.504,2.354,2.166,1.978,1.500,1.776,"6,982","3,712","4,454","3,910","4,699",59.2860°,67.9676°,52.1470°,60.6263°
+9300,+2,2.504,2.354,2.166,1.978,1.524,1.759,"6,982","3,712","4,454","3,910","4,699",58.5355°,67.2997°,52.8374°,61.2268°
+8800,0,2.504,2.354,2.166,1.978,1.570,1.722,"6,982","3,712","4,454","3,910","4,699",57.0441°,65.9756°,54.2241°,62.4352°
+8300,-2,2.504,2.354,2.166,1.978,1.614,1.683,"6,982","3,712","4,454","3,910","4,699",55.5645°,64.6664°,55.6193°,63.6543°
+7800,-3,2.504,2.354,2.166,1.978,1.635,1.662,"6,982","3,712","4,454","3,910","4,699",54.8288°,64.0169°,56.3204°,64.2681°
+6700,S
+6550,A,B,C,D,E,F,G,H,I,J,K,라이닝 두께
+6450,(%)
+6050,+3,6.615,1.735,1.451,1.608,1.293,0.000,-0.430,0.509,0.785,-0.638,-0.362,300
+5550,+2,6.615,1.735,1.451,1.608,1.293,0.000,-0.430,0.555,0.739,-0.592,-0.408,300
+5050,0,6.615,1.735,1.451,1.608,1.293,0.000,-0.430,0.647,0.647,-0.500,-0.500,300
+4600,-2,6.615,1.735,1.451,1.608,1.293,0.000,-0.430,0.739,0.555,-0.408,-0.592,300
+4100,-3,6.615,1.735,1.451,1.608,1.293,0.000,-0.430,0.785,0.509,-0.362,-0.638,300

scripts/dump_std_table.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+"""Task 4: dump the variable table of the standard section (C0060303-001) as a
+coordinate grid. Rows = cross slope (S, 편경사) per user answer 2026-10-21; the
+first row = variable names. Every TEXT on the table layers is kept (no regex
+filter), so that the S column and the header row can be checked."""
+import csv
+import sys
+from collections import defaultdict
+
+import ezdxf
+
+SRC, OUT = sys.argv[1], sys.argv[2]
+msp = ezdxf.readfile(SRC).modelspace()
+cells = [(round(e.dxf.insert.x, 1), round(e.dxf.insert.y, 1), e.dxf.text.strip())
+         for e in msp.query("TEXT") if e.dxf.layer in ("CS-TABL-TEX1", "CS-TABL-TEX2")]
+rows = defaultdict(list)
+for x, y, s in cells:
+    rows[round(y / 50) * 50].append((x, s))  # bucket by ~50 mm
+with open(OUT, "w", newline="", encoding="utf-8") as fh:
+    w = csv.writer(fh)
+    for y in sorted(rows, reverse=True):
+        line = [s for x, s in sorted(rows[y])]
+        w.writerow([y] + line)
+        print(f"Y{y:>7}: " + " | ".join(f"{x:.0f}:{s}" for x, s in sorted(rows[y])))