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-lyrics-index.csv

@@ -24,24 +24,23 @@ start,stop,start_s,stop_s,sung,object,kind,km,lat,lon,km_from,km_to
 01:24.44,01:27.06,84.44,87.06,新夕張駅,新夕張駅,railway station,52.54,42.93670,142.03648,,
 01:27.06,01:30.02,87.06,90.02,紅葉山郵便局,紅葉山郵便局,post office,52.61,42.93642,142.03925,,
 01:30.02,01:32.30,90.02,92.30,紅葉山神社,紅葉山神社,Shinto shrine,52.85,42.93788,142.03956,,
-01:32.30,01:35.42,92.30,95.42,セイコーマートもみじやま店,セイコーマートもみじやま店,convenience store,52.99,42.93910,142.04167,,
-01:35.42,01:37.92,95.42,97.92,紅葉山橋,紅葉山橋,bridge (structure),53.01,42.94353,142.04306,,
-01:37.92,01:39.46,97.92,99.46,紅楓橋,紅楓橋,bridge,53.13,42.93855,142.04317,,
-01:39.46,01:41.54,99.46,101.54,ポン久留喜橋,ポン久留喜橋,bridge,53.69,42.93697,142.04976,,
-01:41.54,01:43.84,101.54,103.84,久留喜橋,久留喜橋,bridge,53.69,42.93697,142.04976,,
-01:43.84,01:45.05,103.84,105.05,楓橋,楓橋,bridge,55.41,42.92957,142.06562,,
-01:45.05,01:46.47,105.05,106.47,桂橋,桂橋,bridge,55.60,42.93026,142.06775,,
-01:46.84,01:48.90,106.84,108.90,夕張市楓,夕張市楓,district,56.60,42.93414,142.07860,56.60,57.84
-01:48.90,01:50.84,108.90,110.84,千紫橋,千紫橋,bridge,56.60,42.93414,142.07860,,
-01:50.84,01:52.07,110.84,112.07,楓駐車帯,楓駐車帯,parking,57.08,42.93352,142.08412,,
-01:52.07,01:53.93,112.07,113.93,万紅橋,万紅橋,bridge,57.25,42.93274,142.08627,,
-01:53.93,01:55.61,113.93,115.61,登川神社,登川神社,Shinto shrine,57.44,42.93395,142.08819,,
-01:55.61,01:57.32,115.61,117.32,楓信号場,楓信号場,railway signal post,57.76,42.93157,142.09230,,
+01:32.30,01:35.24,92.30,95.24,セイコーマートもみじやま店,セイコーマートもみじやま店,convenience store,52.99,42.93910,142.04167,,
+01:35.24,01:38.48,95.24,98.48,紅楓橋,紅楓橋,bridge,53.13,42.93855,142.04317,,
+01:38.48,01:40.25,98.48,100.25,ポン久留喜橋,ポン久留喜橋,bridge,53.69,42.93697,142.04976,,
+01:40.25,01:42.44,100.25,102.44,久留喜橋,久留喜橋,bridge,53.69,42.93697,142.04976,,
+01:42.44,01:43.79,102.44,103.79,楓橋,楓橋,bridge,55.41,42.92957,142.06562,,
+01:43.79,01:45.03,103.79,105.03,桂橋,桂橋,bridge,55.60,42.93026,142.06775,,
+01:45.77,01:49.12,105.77,109.12,夕張市楓,夕張市楓,district,56.60,42.93414,142.07860,56.60,57.84
+01:49.12,01:50.76,109.12,110.76,千紫橋,千紫橋,bridge,56.60,42.93414,142.07860,,
+01:50.76,01:52.51,110.76,112.51,楓駐車帯,楓駐車帯,parking,57.08,42.93352,142.08412,,
+01:52.51,01:53.80,112.51,113.80,万紅橋,万紅橋,bridge,57.25,42.93274,142.08627,,
+01:53.80,01:55.54,113.80,115.54,登川神社,登川神社,Shinto shrine,57.44,42.93395,142.08819,,
+01:55.54,01:57.32,115.54,117.32,楓信号場,楓信号場,railway signal post,57.76,42.93157,142.09230,,
 01:57.32,01:59.00,117.32,119.00,登川橋,登川橋,bridge,57.84,42.93167,142.09327,,
 01:59.00,02:00.74,119.00,120.74,登川郵便局,登川郵便局,post office,57.84,42.93185,142.09335,,
 02:01.26,02:02.93,121.26,122.93,夕張市登川,夕張市登川,district,58.23,42.92922,142.09647,58.23,60.29
-02:02.93,02:04.87,122.93,124.87,花園橋,花園橋,bridge,58.23,42.92922,142.09647,,
-02:04.87,02:06.63,124.87,126.63,登川トンネル,登川トンネル,tunnel,60.29,42.92478,142.11599,,
+02:02.93,02:05.23,122.93,125.23,花園橋,花園橋,bridge,58.23,42.92922,142.09647,,
+02:05.23,02:06.62,125.23,126.62,登川トンネル,登川トンネル,tunnel,60.29,42.92478,142.11599,,
 03:30.80,03:34.55,210.80,214.55,勇払郡むかわ町穂別長和,勇払郡むかわ町穂別長和,district,62.36,42.90892,142.12482,62.36,62.94
 03:34.55,03:36.77,214.55,216.77,オマナイ橋,オマナイ橋,bridge,62.36,42.90892,142.12482,,
 03:36.77,03:39.41,216.77,219.41,桂木橋,桂木橋,bridge,62.94,42.90434,142.12726,,
@@ -60,11 +59,11 @@ start,stop,start_s,stop_s,sung,object,kind,km,lat,lon,km_from,km_to
 04:13.02,04:15.39,253.02,255.39,穂別大橋,穂別大橋,bridge,72.29,42.88820,142.17918,,
 04:15.39,04:18.81,255.39,258.81,山水橋,山水橋,bridge,72.90,42.89187,142.18476,,
 04:18.81,04:23.20,258.81,263.20,沼の沢橋,沼の沢橋,bridge,74.31,42.88830,142.20015,,
-04:23.20,04:24.97,263.20,264.97,稲里トンネル,稲里トンネル,tunnel,75.28,42.88343,142.20951,,
+04:23.20,04:25.27,263.20,265.27,稲里トンネル,稲里トンネル,tunnel,75.28,42.88343,142.20951,,
 04:26.00,04:29.74,266.00,269.74,勇払郡むかわ町穂別福山,勇払郡むかわ町穂別福山,district,76.97,42.87802,142.22782,76.97,88.25
 04:29.74,04:31.50,269.74,271.50,ペンケ橋,ペンケ橋,bridge,76.97,42.87802,142.22782,,
-04:31.50,04:33.62,271.50,273.62,下福山橋,下福山橋,bridge,77.05,42.88572,142.23487,,
-04:33.62,04:35.02,273.62,275.02,オロロップ橋,オロロップ橋,bridge,77.55,42.87850,142.22868,,
+04:31.50,04:33.62,271.50,273.62,下福山橋,下福山橋,bridge,78.03,42.88572,142.23487,,
+04:33.62,04:35.02,273.62,275.02,オロロップ橋,オロロップ橋,bridge,78.31,42.88721,142.23759,,
 04:35.02,04:37.07,275.02,277.07,福山橋,福山橋,bridge,79.11,42.89249,142.24390,,
 04:37.07,04:38.70,277.07,278.70,福山神社,福山神社,Shinto shrine,79.67,42.89114,142.25175,,
 04:38.70,04:41.02,278.70,281.02,福山大橋,福山大橋,bridge,80.24,42.88678,142.25416,,