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/sources/175_Yevgini.txt

@@ -74,6 +74,340 @@ The victim, identified as Yevgini, filed a complaint with Samui police on Friday
 
 Four Russians arrived at the coffee shop in a black van and were joined by two others, who arrived on a motorcycle. Yevgini alleges that the men approached him and threatened to harm him if he did not transfer his Bitcoins, estimated to be worth about 112 million baht, to them.
 
+------------------------------------------------------------------------------------------------
+FETCHED ARTICLE 1  [RAW EXTRACT — NOT YET TRIMMED]
+  !! This is the whole page as extracted. It still contains site furniture,
+  !! and may contain teaser headlines for UNRELATED cases. Trim on read-through.
+  !! Do not quote from it without checking the passage belongs to this case.
+  Source     aseannow.com
+  URL        https://aseannow.com/topic/1322601-russian-arrested-on-samui-for-allegedly-robbing-compatriot-of-%E0%B8%BF18m-in-bitcoins/
+  Field      url
+  Retrieved  2026-09-05T12:50:45+00:00 via raw HTTP retrieval, deterministic extraction (HTTP 200)
+  Language   unknown
+  Kept       paragraphs ALL 95 paragraphs, untrimmed
+  Length     1,600 chars
+  Integrity  sha256 844aa1b15077aa78f95ed6ed84dc7516e2f0880bf2ec03a2a0e6116a64a5e13e
+  Trimmed    NOT TRIMMED. Full page extract; trim on read-through.
+  Caveat     retrieved from a live page on the date above. Unlike text copied
+             from the spreadsheet, there is no second copy to hash it against.
+------------------------------------------------------------------------------------------------
+
+ORIGINAL (unknown, verbatim as retrieved)
+
+Russian arrested on Samui for allegedly robbing compatriot of ฿1.8m in Bitcoins - Koh Samui News - ASEAN NOW
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+ Skip to content
+
+A better way to browse. Learn more.
+
+A full-screen app on your home screen with push notifications, badges and more.
+
+Scroll the menu and tap Add to Home Screen.
+
+Tap Add in the top-right corner.
+
+Tap the 3-dot menu (⋮) in the top-right corner of the browser.
+
+Tap Add to Home screen or Install app.
+
+Confirm by tapping Install.
+
+No registered users viewing this page.
+
+Tap the lock icon next to the address bar.
+
+Tap Permissions → Notifications.
+
+Adjust your preference.
+
+Click the padlock icon in the address bar.
+
+Select Site settings.
+
+Find Notifications and adjust your preference.
+
+Ensure the site is installed via Add to Home Screen.
+
+Open Settings App → Notifications.
+
+Find your app name and adjust your preference.
+
+Go to Safari → Preferences.
+
+Click the Websites tab.
+
+Select Notifications in the sidebar.
+
+Find this website and adjust your preference.
+
+Tap Permissions.
+
+Click Permissions for this site.
+
+Go to Settings → Site permissions.
+
+Tap Notifications.
+
+Find this site in the list and adjust your preference.
+
+Open Firefox Settings.
+
+Search for Notifications.
+
 ================================================================================================
 generated from attacks-export-Gart-website.json + reported_K&R  |  case 175
 ================================================================================================