feat(sources): fetch linked URLs for the 252 spreadsheet-only cases

Until now only cases 357+ (plus a few older ones) had their linked URLs
fetched; the other 252 dossiers held just the text pasted into the
spreadsheet, often only the lede. This pass fetches every linked URL for
those cases so the full text is on file before link rot takes it.

- stage_all.py: new --include-sheet-cases flag that lifts the skip on
  cases holding spreadsheet articles. Resumable as before.
- staging/: raw extracts and index.json for the 252 cases.
- sourced-articles.json, case-files-manifest.json: 188 new UNTRIMMED
  blocks. 179 cases gained at least one fetched article; 73 got none
  (49 BLOCKED, 18 THIN, 9 DEAD, 4 video/social, 3 ERROR).
- sources/*.txt: rebuilt with build_cases.py --all. Sheet pastes are
  kept; fetched blocks sit beside them under the NOT YET TRIMMED banner.
  Files previously committed with CRLF are now LF.
- wayback-availability.json: Wayback snapshots exist for 73 of the 98
  failed URL slots; input for an archive-fetch pass.
- README-START-HERE.md: progress note and next step.

verify_all.py PASSES (1836 checks).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GZZENdTLzNGsbNy4DyF1yt

merge-output/staging/014/01_tokyoreporter-com.txt

@@ -0,0 +1,32 @@
+Aichi cops accuse pair of dumping Nagoya woman's corpse in Shiga | TokyoReporter 
+ Press "Enter" to skip to content
+
+Aichi cops accuse pair of dumping Nagoya woman’s corpse in Shiga
+
+By Tokyo Reporter Staff on August 2, 2017
+
+SHIGA (TR) – Aichi Prefectural Police have accused two persons of abandoning the corpse of a missing woman from Nagoya in a mountainous area of Shiga Prefecture earlier this year, reports Nippon News Network (Aug. 1).
+
+On around June 20, Ichiya Nishida, a 20-year-old resident of Ogaki City, Gifu Prefecture, and an 18-year-old boy from Shiga, allegedly buried the body of Miyuki Noda, 53, who went missing two days before, in a forested area of the town of Taga.
+
+Nishida and the other suspect, who have been accused of abandoning a corpse, admit to the allegations. On Monday evening, a team of about 80 officers working off information provided by the suspects unearthed the body of Noda.
+
+Nishida had previously met Noda at a seminar about virtual currencies, police said. Prior to his arrest, he had been undergoing voluntary questioning in the case. On Sunday, police found Noda’s smartphone and bag during a search of the vehicle and residence of Nishida.
+
+Noda went missing following a seminar about selling food products and cosmetics over the internet, held on June 18 in Kasugai City, Aichi. After the event, she told participants that she was going to meet an acquaintance. That night, she was seen boarding a vehicle registered to Nishida at JR Ogaki Station in Gifu.
+
+In carrying out the crime, the suspects are believed to have stuffed the body of Noda into a bag before carrying it to the forest in Taga. The corpse was buried using construction machinery, police said.
+
+It is expected that murder and robbery charges will be applied to the suspects, police said.
+
+Published in Crime, Japan, Japan Breaking News, Nagoya and News
+
+The editorial team at The Tokyo Reporter brings the site's readership the latest news from the under side of Japan.
+
+Tokyo man accused of sexually assaulting matchmaking app date at his apartment
+
+Tokyo man arrested over arson attack on elderly woman’s home
+
+Fukushima bar manager accused of dumping sister’s corpse hints at murder amid debt speculation
+
+Myanmar student arrested after newborn corpse found in Saitama apartment

merge-output/staging/014/index.json

@@ -0,0 +1,16 @@
+[
+  {
+    "case": 14,
+    "n": 1,
+    "field": "url",
+    "url": "https://www.tokyoreporter.com/japan/nagoya/aichi-cops-accuse-pair-of-dumping-nagoya-womans-corpse-in-shiga/",
+    "host": "tokyoreporter.com",
+    "fetched_at": "2026-09-05T12:56:41+00:00",
+    "verdict": "FETCHED",
+    "method": "raw",
+    "http": 200,
+    "chars": 2299,
+    "sha256": "50c61594c4a92799b7bc0763f059ff13a9ec2967a60710f21493f6458a4b763d",
+    "final_url": null
+  }
+]