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/296/01_gulfnews-com.txt

@@ -0,0 +1,39 @@
+Dubai Court sentences four to jail for robbing woman of Dh300,000 in Bitcoin scam
+
+The defendants have also been asked to pay a fine of Dh342,000
+
+Dubai: The Dubai Court of First Instance has sentenced a gang to one year in jail to be followed by deportation in a Bitcoin scam.
+
+According to official records, a woman wanted to buy Bitcoins for Dh300,000.
+
+She went to meet the seller at Al Nahda with two friends when two men threatened them with an axe.
+
+“We were waiting for the buyer when two men came carrying an axe threatened to harm us. They stole the bag of money and other valuables,” claimed the victim in official records.
+
+The other two men were monitoring the area and the gang members escaped the scene.
+
+A man heard the women’s yell for help and managed to record the number of the escaping car.
+
+Dubai Police caught up with a suspect who was identified by the women and arrested.
+
+He claimed that a friend asked to drop him in Al Nahda for a Bitcoin deal.
+
+“I dropped them to the place and they went to a parking area between buildings. After two minutes, they returned and asked me to leave quickly. They were carrying bags and a laptop,” said the defendant in records.
+
+He guided officers to the defendants’ places.
+
+Dubai Public Prosecution has charged the four defendants with robbery.
+
+They were sentenced to one year in jail to be followed by deportation.
+
+Judges ordered them to pay a fine of Dh342,188.
+
+The verdict will be a subject to appeal within 15 days.
+
+Man arrested in Sharjah for killing two sisters
+
+Dubai arrests singer over Dh9,000 fake visa scam
+
+Man thought he was a cat after taking drugs: Prosecutor
+
+Two fined Dh50,000 each over petrol station dispute

merge-output/staging/296/index.json

@@ -0,0 +1,16 @@
+[
+  {
+    "case": 296,
+    "n": 1,
+    "field": "url",
+    "url": "https://gulfnews.com/uae/crime/dubai-court-sentences-four-to-jail-for-robbing-woman-of-dh300000-in-bitcoin-scam-1.85729037",
+    "host": "gulfnews.com",
+    "fetched_at": "2026-09-05T12:44:37+00:00",
+    "verdict": "FETCHED",
+    "method": "raw",
+    "http": 200,
+    "chars": 1693,
+    "sha256": "5713fd5ab42d7684d259cf43342a1dcaa7f71c18e41fc8622d705b492572faf6",
+    "final_url": null
+  }
+]