feat: scan pattern drawings for station ranges and pattern names (Task 5)

No station range is written next to pattern names in 03-003..008; the pattern
names appear only in file names. 04-006..008 name WL/RP zones at the portals
without stations. Pattern-to-station mapping is left open, not inferred.

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

scripts/extract_pattern_stations.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+"""Task 5: support-pattern (지보패턴) station ranges from drawings 03-003..008.
+Collects every TEXT that names a station (STA. / N+mmm / N+mmm.mm) and every
+pattern name (NP-...) with its layer and position, without interpreting ranges."""
+import glob
+import os
+import re
+import sys
+
+import ezdxf
+
+RAG = sys.argv[1]
+pat_re = re.compile(r"NP-\d[A-Z0-9-]*|WL-\d")
+sta_re = re.compile(r"(STA\.?\s*)?\d{1,2}\+\d{2,3}(\.\d{2})?")
+files = sorted(glob.glob(os.path.join(RAG, "03_본선터널굴착", "C0060303-00[3-8]*.dxf")))
+for f in files:
+    msp = ezdxf.readfile(f).modelspace()
+    stas, pats = [], set()
+    for e in msp.query("TEXT MTEXT"):
+        s = e.dxf.text if e.dxftype() == "TEXT" else e.plain_text()
+        for m in sta_re.finditer(s):
+            stas.append((round(e.dxf.insert.x), round(e.dxf.insert.y), m.group(0).strip()))
+        for m in pat_re.finditer(s):
+            pats.add(m.group(0))
+    print(os.path.basename(f)[:28], "| patterns:", sorted(pats))
+    for x, y, t in sorted(stas, key=lambda r: (r[0], r[1]))[:12]:
+        print(f"    ({x},{y}) {t}")
+    print(f"    station-like texts: {len(stas)}")