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/206/01_bangkokpost-com.txt

@@ -0,0 +1,42 @@
+Turkish man tied up and robbed in Pattaya Bangkok Post Learning - Learn English from News
+
+Turkish man tied up and robbed in Pattaya
+
+ORIGINAL SOURCE/WRITER: 
+ Chaiyot Pupattanapong
+
+A Turkish man was tied up and robbed in a condominium room in Pattaya early on Tuesday morning.
+
+A security guard said Masis Erkol, 36, hopped from his room on the fifth floor seeking help. His hands were fastened behind him with handcuffs and cable ties and his ankles bound with wire.
+
+The robbery happened at a condominium building in Soi Wat Bun Kanchanaram and was reported to Pattaya police about 3.36am.
+
+The man told police that three men held and tied him up. They forced him to transfer a large amount of cryptocurrency to a wallet and also stole his computer.
+
+Police said it was likely Mr Erkol knew his attackers because the condominium had a good security system. The building's name was not given.
+
+ankle: the part at the bottom of your leg where your foot joins your leg - ข้อเท้า
+
+cryptocurrency (noun): one of a number of currencies used as digital cash without involving the banking system -
+
+fasten (verb): to fix or place something in a particular position, so that it will not move - มัด, รัด, คาด
+
+handcuffs: two metal rings joined by a short chain which lock around a prisoner's wrists on someone - กุญแจมือ
+
+wires (noun): metal in the form of thin threads - สายโลหะ
+
+Do you like the content of this article?
+
+Two US sailors sent back to ship after drunken Pattaya brawl
+
+Seating collapse stops Thai rockers’ farewell show
+
+US sailors on leave begin exploring Pattaya
+
+Air travellers offered free 10kg fruit check-in for a year
+
+Thai Translation: มีความรับผิดชอบ-footer
+
+To enjoy the full Bangkok Post experience,
+
+please disable your ad blocker.

merge-output/staging/206/index.json

@@ -0,0 +1,16 @@
+[
+  {
+    "case": 206,
+    "n": 1,
+    "field": "url",
+    "url": "https://www.bangkokpost.com/learning/easy/2939397/turkish-man-tied-up-and-robbed-in-pattaya",
+    "host": "bangkokpost.com",
+    "fetched_at": "2026-09-05T12:49:11+00:00",
+    "verdict": "FETCHED",
+    "method": "raw",
+    "http": 200,
+    "chars": 1753,
+    "sha256": "3dcff613f872586be9e8fa25a33b2405ccb6cb6fe7863a06f0d79d4a6ca4cce7",
+    "final_url": null
+  }
+]