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/058/01_theguardian-com.txt

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+Police say abducted Norwegian woman probably murdered | Norway | The Guardian
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+ Skip to main contentSkip to navigation
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+Police say abducted Norwegian woman probably murdered
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+Investigator says kidnapping possibly staged to disguise killing of Anne-Elisabeth Hagen, wife of wealthy investor
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+The wife of a wealthy Norwegian businessman who disappeared nearly eight months ago was probably killed and the murder made to look like a kidnapping, police have said.
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+Anne-Elisabeth Hagen, whose husband, Tom Hagen, is a real estate investor and energy magnate, went missing from their home in Lørenskog, near Oslo, on 31 October.
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+The Verdens Gang daily reported that the presumed abductors had demanded €9m (£8m) in the cryptocurrency Monero, a digital cash system that is especially hard to trace. A ransom note had been found at the couple’s home. Police at the time refused to confirm the sum but said they had advised the family not to pay.
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+Online contacts with the presumed kidnappers earlier in the investigation were unable to confirm that those people were holding Hagen, 68, or that she was still alive.
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+Tommy Brøske, the lead investigator, told a news conference: “As a result, our main hypothesis has been modified – Anne-Elisabeth was killed. There may have been an attempt to disguise the murder as a kidnapping.”.
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+He added that the supposed abductors’ lack of a desire to “bank the ransom” was one of the other key factors behind the conclusion. He declined to state whether police had any suspects in the case.
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+The family’s lawyer, Svein Holden, told reporters he viewed the crime as a “kidnapping that turned into a possible murder”.
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+Tom Hagen, in his late 60s, has an estimated fortune of €174m, according to the magazine Kapital.

merge-output/staging/058/index.json

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+[
+  {
+    "case": 58,
+    "n": 1,
+    "field": "url",
+    "url": "https://www.theguardian.com/world/2019/jun/26/police-say-abducted-norwegian-woman-anne-elisabeth-hagen-probably-murdered?utm_term=Autofeed&CMP=twt_gu&utm_medium=&utm_source=Twitter#Echobox=1561567155",
+    "host": "theguardian.com",
+    "fetched_at": "2026-09-05T12:54:43+00:00",
+    "verdict": "FETCHED",
+    "method": "raw",
+    "http": 200,
+    "chars": 1902,
+    "sha256": "3aab55da14f756ad3d782cf83029fcfdbc28d43789f11d0e6c99ee8043908062",
+    "final_url": null
+  }
+]