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/198/01_9news-com-au.txt

@@ -0,0 +1,31 @@
+Mickleham news: Shopping centre CCTV captures thieves in Bitcoin ATM ram raid | Nine.com.au
+
+Police are on the hunt for a pair of thieves who escaped with a cryptocurrency ATM after a ram raid at a shopping centre in Melbourne's northern suburbs this morning.
+
+Police allege a stolen Toyota Ute rammed the front doors of Merrifield City shopping centre in Mickleham just after 4am, before reversing into two ATM machines inside.
+
+CCTV vision exclusively obtained by 9News shows one of the men, dressed in bright orange, using a sledge hammer to knock a Coinflip Bitcoin ATM to the ground.
+
+The pair then ditched the Toyota when the machine proved too heavy to lift onto the back tray and instead dragged it out by hand, fleeing the scene in a dark-coloured sedan with the Coinflip ATM.
+
+Police will allege the thieves then dumped the ATM in a Coolaroo car park, before setting it alight.
+
+The Coinflip ATM, which allow users to buy and sell crypto using cash, had been pried open.
+
+Crypto expert Steve Sammartino said crypto machines do not have the same security measures as conventional ATMS, which could have aided the thieves.
+
+"The crypto machines aren't as robust as typical ATMs which are issued via banks," Sammartino said.
+
+"Not all of them have dye bombs so that the money is unusable after they're broken into."
+
+The offenders remain on the run and the sedan has not been located at this stage.
+
+Anyone who witnessed the ram-raid or the fire, has dashcam/CCTV footage or information is urged to contact Crime Stoppers on 1800 333 000.
+
+The Aussie family who moved overseas to buy a house back home
+
+Five children hospitalised after jumping castles go airborne in two separate incidents
+
+Qantas plane diverted after suspected engine issue
+
+More than 46,000 homes without power as destructive winds lash NSW

merge-output/staging/198/index.json

@@ -0,0 +1,16 @@
+[
+  {
+    "case": 198,
+    "n": 1,
+    "field": "url",
+    "url": "https://www.9news.com.au/national/police-hunt-crypto-atm-thieves-in-melbourne-shopping-centre-ram-raid-mickleham/8e7b6106-ab8c-4374-82b5-76f147c42da8",
+    "host": "9news.com.au",
+    "fetched_at": "2026-09-05T12:49:39+00:00",
+    "verdict": "FETCHED",
+    "method": "raw",
+    "http": 200,
+    "chars": 1816,
+    "sha256": "d4aafb096d74a5d9d4fa6d017daf2c995e7abdce2006f8ee1956b2b7b2098415",
+    "final_url": "https://www.nine.com.au/australia-news/police-hunt-crypto-atm-thieves-in-melbourne-shopping-centre-ram-raid-mickleham-20241203-p5z8x5.html"
+  }
+]