274: drop 紅葉山橋, fix オロロップ橋 and 下福山橋, re-timed lyric

紅葉山橋 is not on R274. The full Reiwa 8 bridge register lists it once, on
国道452号 (100.1 m, PC, 1989), just up R452 from the 紅葉山交差点. It had come
in through the OSM corridor sweep, which selected by distance rather than by
road — hence the only `bridge (structure)` kind in the roster and its 533 m
offset. An audit of all 53 roster structures against every route in the three
registers found no other stray.

オロロップ橋 moves to 78.31 km from the author's Google pin, on the 221 m OSM
bridge way that matches the register's 205.9 m. 下福山橋 moves to 78.03, the
104 m way. Both had been displaced by using the オロロップ沢川 stream crossing at
77.05 as an anchor; the stream and the bridge are 1.2 km apart. The sung order
ペンケ → 下福山 → オロロップ → 福山 was already right.

Lyric re-timed by the author with 紅葉山橋 removed; 274.md and 274.lrc match.
Lyric index regenerated: 97 lines, 98 rows, zero backward km steps.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

wip/274/274-lookup.csv

@@ -34,7 +34,6 @@ km,name,object,kana,romaji,kind,offset_m,lat,lon,length_m,built,grade,oaza,addre
 52.61,紅葉山,紅葉山郵便局,もみじやまゆうびんきょく,Momijiyama yuubinkyoku,post office,54,42.93642,142.03925,,,,紅葉山,夕張市紅葉山,ゆうばりしもみじやま,
 52.85,紅葉山,紅葉山神社,もみじやまじんじゃ,Momijiyama jinja,Shinto shrine,67,42.93788,142.03956,,,,紅葉山,夕張市紅葉山,ゆうばりしもみじやま,
 52.99,セイコーマート,セイコーマートもみじやま店,せいこーまーともみじやまてん,Seikoomaatomomijiyama ten,convenience store,31,42.93910,142.04167,,,,紅葉山,夕張市紅葉山,ゆうばりしもみじやま,
-53.01,紅葉山,紅葉山橋,もみじやまはし,Momijiyama hashi,bridge (structure),533,42.94353,142.04306,,,,紅葉山,夕張市紅葉山,ゆうばりしもみじやま,
 53.13,紅楓,紅楓橋,こうふうばし,Koufuu bashi,bridge,0,42.93855,142.04317,102.5,1958,Ⅱ,紅葉山,夕張市紅葉山,ゆうばりしもみじやま,夕張市
 53.69,久留喜,ポン久留喜橋,ぽんくるきはし,Ponkuruki hashi,bridge,0,42.93697,142.04976,12.7,1984,Ⅰ,紅葉山,夕張市紅葉山,ゆうばりしもみじやま,夕張市
 53.69,久留喜,ポンクルキ川,,,watercourse,16,42.93695,142.04995,,,,紅葉山,夕張市紅葉山,ゆうばりしもみじやま,石狩川水系
@@ -81,8 +80,8 @@ km,name,object,kana,romaji,kind,offset_m,lat,lon,length_m,built,grade,oaza,addre
 75.28,稲里,稲里トンネル,いなさととんねる,Inasato tonneru,tunnel,0,42.88343,142.20951,1441,1985,Ⅲ,穂別長和,勇払郡むかわ町穂別長和,ゆうふつぐんむかわちょうほべつおさわ,むかわ町
 76.97,ペンケ橋,ペンケ橋,ぺんけばし,Penke bashi,bridge,0,42.87802,142.22782,120.7,1985,Ⅲ,穂別福山,勇払郡むかわ町穂別福山,ゆうふつぐんむかわちょうほべつふくやま,むかわ町
 77.05,オロロップ,オロロップ沢川,,,watercourse,15,42.87849,142.22885,,,,穂別福山,勇払郡むかわ町穂別福山,ゆうふつぐんむかわちょうほべつふくやま,鵡川水系
-77.05,下福山,下福山橋,しもふくやまはし,Shimofukuyama hashi,bridge,0,42.88572,142.23487,129.9,1982,Ⅰ,穂別福山,勇払郡むかわ町穂別福山,ゆうふつぐんむかわちょうほべつふくやま,むかわ町
-77.55,オロロップ,オロロップ橋,おろろっぷはし,Ororoppu hashi,bridge,0,42.87850,142.22868,205.9,1983,Ⅱ,穂別福山,勇払郡むかわ町穂別福山,ゆうふつぐんむかわちょうほべつふくやま,むかわ町
+78.03,下福山,下福山橋,しもふくやまはし,Shimofukuyama hashi,bridge,0,42.88572,142.23487,129.9,1982,Ⅰ,穂別福山,勇払郡むかわ町穂別福山,ゆうふつぐんむかわちょうほべつふくやま,むかわ町
+78.31,オロロップ,オロロップ橋,おろろっぷはし,Ororoppu hashi,bridge,0,42.88721,142.23759,205.9,1983,Ⅱ,穂別福山,勇払郡むかわ町穂別福山,ゆうふつぐんむかわちょうほべつふくやま,むかわ町
 79.11,福山,福山橋,ふくやまはし,Fukuyama hashi,bridge,0,42.89249,142.24390,134.7,1984,Ⅲ,穂別福山,勇払郡むかわ町穂別福山,ゆうふつぐんむかわちょうほべつふくやま,むかわ町
 79.67,福山,福山神社,ふくやまじんじゃ,Fukuyama jinja,Shinto shrine,184,42.89114,142.25175,,,,穂別福山,勇払郡むかわ町穂別福山,ゆうふつぐんむかわちょうほべつふくやま,
 79.81,福山第1ゲート,福山第1ゲート,,,gate,71,42.89003,142.25118,,,,穂別福山,勇払郡むかわ町穂別福山,ゆうふつぐんむかわちょうほべつふくやま,