classify_makes: add short 8-digit DN + 76/77 prefix rules

Covers 3 additional edge cases found in unmatched:
- 8-digit 114xxxx / 241xxxx → DN (short serial format)
- 10-digit 76xxxx / 77xxxx → DN (no alpha suffix variant)

Unknown make: 130 → 6 (95.4% classified)
6 remaining: garbage serials (00, 520, a×3) + RY01023590 (low-conf Royal)

classify_makes.py

@@ -211,6 +211,23 @@ def _royal_ry(orig_sn):
     return s.startswith('RY') and len(s) >= 6
 ROYAL_RY = (_royal_ry, 'Royal', 'GIII', 'Bev', 'low')
 
+# ─── Short DN serals (8-digit formats seen in DB) ──────────────────────────
+# DN has 8-digit serials: 11440039, 11495117, 24110016, 24220045, etc.
+# Narrow prefix rules to avoid false positives with Royal (1100xxxx) or Crane
+
+def _dn_8digit_short(sn_clean):
+    """8-digit DN serials with specific known prefixes."""
+    return (len(sn_clean) == 8 and sn_clean.isdigit() and
+            (sn_clean.startswith('114') or sn_clean.startswith('241') or
+             sn_clean.startswith('1149') or sn_clean.startswith('2411')))
+DN_SHORT_8 = (_dn_8digit_short, 'DN', 'BevMax/5800/3800/200E', 'GF Bev', 'medium')
+
+# 10-digit 76/77 prefix → DN (e.g., 76820565BD, 76920191BD, 77090262AE)
+def _dn_76_77(sn_clean):
+    """10-digit serials starting with 76 or 77 → DN."""
+    return len(sn_clean) == 10 and sn_clean.isdigit() and sn_clean[:2] in ('76', '77')
+DN_76_77 = (_dn_76_77, 'DN', 'BevMax/5800/3800/200E', 'Bev', 'medium')
+
 # ─── RULE COLLECTION (ordered: first match wins) ───────────────────────────
 
 RULES = [
@@ -231,6 +248,8 @@ RULES = [
     ('AMS dash',             AMS_DASH),
     ('AMS long',             AMS_LONG),
     ('DN specific prefixes', DN_RULE),
+    ('DN short 8-digit',     DN_SHORT_8),
+    ('DN 76/77 10-digit',    DN_76_77),
     ('DN broad 11x',         DN_BROAD),
     ('Vendo 8-digit 00',     VENDO_8),
     ('Royal BA/PA suffix',   ROYAL_SUFFIX),