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/303/01_khaleejtimes-com.txt

@@ -0,0 +1,35 @@
+Dubai: Man robbed of Dh183,000 after being lured by fake Bitcoin deal | Khaleej Times
+
+Dubai: Man robbed of Dh183,000 after being lured by fake Bitcoin deal
+
+He was assaulted and the robbers took three phones, documents and bank cheques as well after threatening to kill him
+
+PUBLISHED: Mon 28 Nov 2022, 8:49 AM UPDATED: Mon 28 Nov 2022, 11:42 AM
+
+Two people have been jailed of robbing an investor and his friend after deceiving them with a fake Bitcoin deal.
+
+The details of the case go back to last July, when an Asian investor reported that he had been robbed and assaulted inside his residence in the Mankhool area of ​​Dubai. He said that one of his friends (the second victim) suggested that he invest in digital currency and gave him a promoter number to buy Bitcoin.
+
+UAE President pardons Abdul Rahman Yusuf Al Qaradawi after criminal conviction
+
+Sharjah Ruler approves Dh20,000 monthly living allowance for govt employees, other groups
+
+US VP Vance says would not 'call it a war' with Iran, on categorising hostilities
+
+Sharjah Police arrest man accused of killing two Kazakh sisters
+
+US military disables 3 vessels, redirects 87 in ongoing Iran blockade
+
+The broker came to his house and asked to see the cash value of the digital currency the victim wished to buy. After checking the money he left, promising to return with the man who would sell him Bitcoin within 15 minutes.
+
+He waited in his residence for them to arrive. Minutes later, the broker called him and said that the seller was hesitating to complete the deal at the residence. He then heard a knock on the door, and was assaulted by two men who immobilised him, stole the bag which contained Dh183,000, three phones, documents and bank cheques. They also threatened to kill the victim.
+
+The Dubai Criminal Court convicted them, sentenced them to three years in prison, fined them the stolen money, and ordered their deportation after serving their sentences.
+
+Dh1.4 million scam in UAE: Trio dupes woman by creating false identity of man, promises to marry her
+
+UAE: Mother sues private school after it takes tuition fees and does not open for next academic year
+
+Qatar rejects Iran’s claims, says selective use of security report is ‘misleading’
+
+UAE latest flight updates: Almost 20 services delayed or cancelled after renewed US-Iran attacks

merge-output/staging/303/index.json

@@ -0,0 +1,16 @@
+[
+  {
+    "case": 303,
+    "n": 1,
+    "field": "url",
+    "url": "https://www.khaleejtimes.com/uae/crime/dubai-man-robbed-of-dh183000-lured-after-being-lured-by-fake-bitcoin-deal",
+    "host": "khaleejtimes.com",
+    "fetched_at": "2026-09-05T12:44:21+00:00",
+    "verdict": "FETCHED",
+    "method": "raw",
+    "http": 200,
+    "chars": 2322,
+    "sha256": "fc9682dd746a55478286917bdd475b2df9bf8c15b5fece1afdf5729627904436",
+    "final_url": null
+  }
+]