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/025/01_cointelegraph-com.txt

@@ -0,0 +1,35 @@
+Russia: Blogger Who ‘Boasted’ About Crypto Wealth Beaten and Robbed For $425k
+
+Written by William Subergstaff writerReviewed by Igor Belkinformer editor
+
+Attackers have mugged a cryptocurrency millionaire for almost half a million dollars during a visit to his home in St. Petersburg, Russia.
+
+A Russian cryptocurrency investor and blogger known online as Pavel Nyashin was attacked and robbed in his home in Leningrad Oblast the night of Jan. 14. The assailants stole funds worth 24 mln rubles ($425,000), according to local media.
+
+Nyashin was tied and beaten while a group of masked assailants stole a safe containing cash and “essential documents.”
+
+Nyashin, a self-made millionaire from cryptocurrency investing, had “boasted” about his wealth online and at meetings of well-known bloggers he attended, local media network NTV reports.
+
+The crypto blogger told NTV in a video interview:
+
+“They took the safe in the end, as they knew there was cash in the house. In it was a sum equivalent to 24 mln rubles, as well as a lot of essential documents.”
+
+The 23-year-old Nyashin from St. Petersburg had previously made known about his successes online while advising on how to become rich from cryptocurrency, according to NTV, which ran an admonitory headline “Millionaire blogger beaten and robbed for boasting.” According to Russian-language cryptocurrency news outlet ForkLog, Nyashin is the founder of the YouTube channel on crypto trading that has almost 15,000 subscribers.
+
+ForkLog also reported that the “bandits” destroyed all electronic equipment in Nyashin’s home and fled the scene in what appeared to be a Mercedes.
+
+NTV adds that the assailants further removed a laptop he used to trade on exchanges. Nyashin himself has yet to find out if his accounts have been hacked and assess the full damage done.
+
+A criminal case has been opened on the armed assault, NTV reports.
+
+Cointelegraph previously reported on the fate of EXMO exchange CEO Pavel Lerner, who was kidnapped in the Ukrainian capital Kiev and only released on payment of a $1 mln ransom late last month.
+
+Prior to that, Ukrainian security personnel allegedly tried to steal funds from Anatoly Kaplan, founder and CEO of ForkLog, in a raid of his place of residence, as well as of the ForkLog office, in Odessa.
+
+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/025/index.json

@@ -0,0 +1,16 @@
+[
+  {
+    "case": 25,
+    "n": 1,
+    "field": "url",
+    "url": "https://cointelegraph.com/news/russia-blogger-who-boasted-about-crypto-wealth-beaten-and-robbed-for-425k",
+    "host": "cointelegraph.com",
+    "fetched_at": "2026-09-05T12:56:17+00:00",
+    "verdict": "FETCHED",
+    "method": "raw",
+    "http": 200,
+    "chars": 2775,
+    "sha256": "bf3a98566c5f58fb60c28b2647d8122fd796c3d7756829c4ae4d668d6356e76b",
+    "final_url": null
+  }
+]