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/035/01_cointelegraph-com.txt

@@ -0,0 +1,25 @@
+Moscow Man Mutilated And Mugged For $1 Million In Bitcoin, Local Sources Report
+
+Written by William Subergstaff writerReviewed by Igor Belkinformer editor
+
+A man has lost $1 mln worth of Bitcoin to muggers who attacked him when he refused to part with it, local sources report
+
+A cryptocurrency investor fell victim to unidentified assailants in Moscow who reportedly disfigured him and stole over $1 mln worth of Bitcoin, today, Feb. 23, according to local crypto journal Forklog.
+
+According to Forklog, the victim, who has not been named, was in the southern district of the Russian capital when a group of muggers stopped him and demanded he transfer his holdings.
+
+When he refused, they “mutilated his face with a knife” before he surrendered his collection of around 100 BTC, approximately $1,020,000 at press time, according to the publication.
+
+The incident comes just weeks after robbers targeted a well-known YouTube blogger in St. Petersburg, assaulting him and stealing possessions including funds worth $425,000 from a safe.
+
+The unknown Moscow victim is currently receiving medical attention while police attempt to ascertain the sequence of events, according to Forklog.
+
+Security issues surrounding ownership of and even interaction with cryptocurrency continues to fall under the spotlight in both Russia and neighboring states. The Ukrainian Security Service raid of the Odessa office of Forklog itself in December 2017 highlighted the potential for even authorities to indulge in criminal activity, while the abduction of EXMO exchange CEO Pavel Lerner in Kiev in December only ended after payment of a $1 mln ransom.
+
+Cointelegraph is committed to independent, transparent journalism. This news article is produced in accordance with Cointelegraph’s Editorial Policy and aims to provide accurate and timely information. Readers are encouraged to verify information independently.
+
+Bitcoin ETF inflows hit $3.8B in strongest three-week stretch of 2026
+
+Bitcoin ETF inflows hit $731M, highest since January as BTC reclaims $80K
+
+Bitcoin reclaims $80K as DXY falls amid continuing suspected yen intervention

merge-output/staging/035/index.json

@@ -0,0 +1,16 @@
+[
+  {
+    "case": 35,
+    "n": 1,
+    "field": "url",
+    "url": "https://cointelegraph.com/news/moscow-man-mutilated-and-mugged-for-1-million-in-bitcoin-local-sources-report",
+    "host": "cointelegraph.com",
+    "fetched_at": "2026-09-05T12:55:59+00:00",
+    "verdict": "FETCHED",
+    "method": "raw",
+    "http": 200,
+    "chars": 2123,
+    "sha256": "8db41c293852c7ba4600d464dcaa0bf17cf335cb9f532ba271d30aa678081e43",
+    "final_url": null
+  }
+]