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/034/01_cointelegraph-com.txt

@@ -0,0 +1,29 @@
+Russian Crypto Developer Beaten, Robbed Of 300 BTC On Moscow Streets
+
+Written by Molly Jane Zuckermanformer writerReviewed by Igor Belkinformer editor
+
+Written by Molly Jane Zuckermanformer writer
+
+Russian crypto developer Yury Mayorov was kidnapped in Moscow, beaten, robbed of 300 BTC, and forced by the robbers to take an unknown pill after with a swig of vodka.
+
+Four unknown men kidnapped Yury Mayorov, the creator of cryptocurrency PRIZM, Forklog news outlet reported yesterday, Feb. 26. According to Forklog, Mayorov was robbed of $20,000, 300 bitcoins (BTC), and three iPhones.
+
+Data on CoinMarketCap shows that PRIZM has a total market cap of around $15.5 mln, and is trading at around $1.04 by press time.
+
+According to Mayorov’s own allegations, he was grabbed off of Isakovskogo Street by four men on Feb. 23 at 10:00 pm in Moscow, put into a Mercedes, and beaten while the men drove around the city.
+
+The men took the US dollars, which Mayorov had just exchanged for an upcoming trip to India, the iPhones, and his laptop with access to his crypto wallet with 300 BTC, worth a little over $3 mln today.
+
+Kidnappings and robberies of people involved in cryptocurrencies are becoming more frequent occurrences across Russia and Ukraine.
+
+Four days ago, on Feb. 23, a crypto investor in Moscow was cut in the face with a knife and 100 BTC, now worth about $1 mln, stolen from him. Another attack on a crypto investor took place in St. Petersburg in mid-January, when a crypto YouTube blogger who had bragged about his wealth was attacked and robbed at home of 24 mln rubles, equal to about $428,000.
+
+In December of last year in Ukraine, Pavel Lerner, the director of UK-based crypto exchange EXMO, was kidnapped in Kiev and only released after three days after more than $1 mln in BTC was paid as 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/034/index.json

@@ -0,0 +1,16 @@
+[
+  {
+    "case": 34,
+    "n": 1,
+    "field": "url",
+    "url": "https://cointelegraph.com/news/russian-crypto-developer-beaten-robbed-of-300-btc-on-moscow-streets",
+    "host": "cointelegraph.com",
+    "fetched_at": "2026-09-05T12:56:01+00:00",
+    "verdict": "FETCHED",
+    "method": "raw",
+    "http": 200,
+    "chars": 2303,
+    "sha256": "8c844640592a06442536bbfde5991b9c3a19ef502293e5e4f0ba96c035d64eda",
+    "final_url": null
+  }
+]