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/297/01_khaleejtimes-com.txt

@@ -0,0 +1,45 @@
+Dubai: Four men fined Dh1.7 million for stealing cash from bitcoin trader | Khaleej Times
+
+Dubai: Four men fined Dh1.7 million for stealing cash from bitcoin trader
+
+The victim's hands and feet were tied during the robbery
+
+PUBLISHED: Tue 6 Sept 2022, 10:18 AM UPDATED: Tue 6 Sept 2022, 2:17 PM
+
+Four Asian men have been jointly fined Dh1.7 million for assaulting a bitcoin trader and stealing the same amount from his residence.
+
+Last March, a man reported that he had been attacked in his house and that Dh1.7 million had been stolen from a safe that belonged to his trading partner.
+
+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 man claimed in his testimony that a group of men reached his residence, and told him that his 'address was incorrect'. When he attempted to close the door, the men pushed him and entered the house. After the man fell to the floor, the men put a knife to his neck.
+
+The accused then tied him up with plastic rope and retrieved a key to the safe that was placed under a table. They then proceeded to steal the amount.
+
+After the man managed to untangle himself, he called his partner and the police to inform them of the incident.
+
+The second victim said in his testimony that he received a call from the first victim who informed him of the crime.
+
+After he arrived at the spot, he saw the house in a mess and the safe open, with the cash missing.
+
+Police investigations revealed that the criminals illegally infiltrated the country and fled after committing the crime.
+
+Authorities then undertook a coordinated operation and managed to nab the culprits after zoning down on their location.
+
+During interrogation, the men confessed to the crimes.
+
+UAE: 8 speeding violations explained; why traffic fines range from Dh300 to Dh3,000
+
+UAE: 10 parking offences, fines you need to know
+
+Trump says US may hit Iran's Pickaxe Mountain soon
+
+UAE latest flight updates: Almost 20 services delayed or cancelled after renewed US-Iran attacks

merge-output/staging/297/index.json

@@ -0,0 +1,16 @@
+[
+  {
+    "case": 297,
+    "n": 1,
+    "field": "url",
+    "url": "https://www.khaleejtimes.com/crime/dubai-four-men-fined-dh1-7-million-for-stealing-cash-from-bitcoin-trader",
+    "host": "khaleejtimes.com",
+    "fetched_at": "2026-09-05T12:44:33+00:00",
+    "verdict": "FETCHED",
+    "method": "raw",
+    "http": 200,
+    "chars": 2311,
+    "sha256": "277e69b933215cde7d91121532703ee0e71c9672dd54085c903678e6511fbb4f",
+    "final_url": "https://www.khaleejtimes.com/uae/crime/dubai-four-men-fined-dh1-7-million-for-stealing-cash-from-bitcoin-trader"
+  }
+]