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/024/01_tmj4-com.txt

@@ -0,0 +1,19 @@
+Man allegedly fires gun over bitcoin transaction
+
+North Dakota man arrested in MKE after allegedly firing gun during bitcoin transaction gone wrong
+
+A North Dakota man pleaded not guilty on Wednesday to firing his gun inside a condo near downtown Milwaukee over an attempted bitcoin transaction.
+
+It happened Saturday, December 30 at the 601 Lofts Condominiums, 601 E. Ogden Ave., according to police.
+
+Jonathan Royce, 28, was charged with recklessly endangering safety after allegedly firing his gun at a business associate who was arguing with him and several other people over the sale of the popular cryptocurrency.
+
+The associate, who reported the confrontation to police, said a man named "Dallas" argued in favor of the sale, while Royce wanted it called off. As the argument escalated, Royce pulled out a gun and fired it once, striking a stove vent, according to the criminal complaint.
+
+After surveying the scene, the Milwaukee Police Department recovered a .32 caliber handgun and a deformed bullet. They also arrested Royce, who was found "leaning into a Subaru with Montana plates," the complaint says.
+
+Royce appears to be a felon from North Dakota, according to the complaint.
+
+Speculative investment in bitcoin has increased dramatically over the past year, with one unit of the virtual currency costing as much as $19,000 at one point last month.
+
+Nominate your hero for the Positively Milwaukee Awards

merge-output/staging/024/index.json

@@ -0,0 +1,16 @@
+[
+  {
+    "case": 24,
+    "n": 1,
+    "field": "url",
+    "url": "https://www.tmj4.com/news/local-news/north-dakota-man-arrested-in-mke-after-allegedly-firing-gun-during-bitcoin-transaction-gone-wrong",
+    "host": "tmj4.com",
+    "fetched_at": "2026-09-05T12:56:19+00:00",
+    "verdict": "FETCHED",
+    "method": "raw",
+    "http": 200,
+    "chars": 1419,
+    "sha256": "5509d7d3560ebab1e3eb566063aa0b5b48e627afc24dd8601fa10436d2fdd42b",
+    "final_url": null
+  }
+]