feat(sources): Wayback pass, automatic trimming, detention rule, ten cases re-sourced

Second and third rounds on the dossier pipeline, reviewed locally before commit.

Retrieval
- wayback_pass.py: retries every BLOCKED/DEAD/THIN/ERROR linked source through
  the Wayback Machine; blocks carry the snapshot date, archive URL and the live
  verdict. 143 slots retried: 93 fetched, 37 no snapshot, 12 script shells, 1 PDF.
- fetch_sources.py: fetch_wayback() helper.
- add_extra_sources.py: files staged extra_* finds (web search, not on the DB
  record) into the store with a provenance note.
- Cases re-sourced by web search: 248 (Oslo: Document.no, Avisa Oslo, NRK; the
  linked Le Parisien piece is case 242 and is marked OFF-CASE), 258 Kharkiv,
  260 Singapore, 358 Bangkok, 365 Las Vegas, 388 Verneuil-sur-Seine, 390 Zoersel,
  430 Homestead. 341 of 364 cases now hold a fetched article; 11, 66 and 399
  have no public text source (podcast, police video, direct victim report).

Trimming
- auto_trim.py: case-anchored furniture cut for UNTRIMMED blocks. Finds the body
  run that mentions the case, merges across subheadings and short furniture
  gaps, drops teasers, share bars, date/URL/caption lines and subscription
  pitches; refuses pages with no record term or almost no body. 302 blocks
  trimmed; 16 left on auto-trim-review.md (7 OFF-CASE suspects). Every cut is
  labelled AUTO-TRIMMED, UNREVIEWED in the dossier; the full extract stays in
  staging/. Decisions with anchors in trim-decisions-auto.json.
- build_cases.py / verify_all.py: banners for auto-trimmed and archived blocks,
  staged-file check extended to Wayback blocks, flag legend under the record.

Detention rule
- README "Definitions": the DB field `kidnappings` is the DETENTION violence
  type (victim, guard, staff or relative held to force submission or execute
  the theft), distinct from the Kidnapping scenario (taken away and held).
- detention-flag-review.md / detention-flag-corrections.json: 40 records
  reviewed with evidence; 30 set-to-1 proposals accepted by the owner on
  2026-09-06 (listed in corrections-approved.md), 10 still open.
- apply_detention_wording.py: "Violence Used" in the 70 reviewed summaries now
  names detention explicitly (62 of 70 labelled), supported by the summary's
  own text; idempotent; supersedes the batch scripts' wording.

Worklist and docs
- sofia-worklist.md: 248 decisions, detention rule item replacing the old
  "no abduction" item, fresh-search section for the textless cases.
- README-START-HERE.md: progress notes, run commands, next steps.
- Bug fixed in passing: Wayback blocks stored in-memory text with carriage
  returns; now stored as read back from disk.

verify_all.py PASSES (2321 checks).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GZZENdTLzNGsbNy4DyF1yt

merge-output/sources/371_Chinese-businessman.txt

@@ -26,6 +26,9 @@ DATABASE RECORD
   notes               the bodyguard tipped the victim off, participating in a 6 day kidnapping where they tortured him and negotiated for ransom, later paid by the victim's wife.
   has_processed_date  0
   created_at          2025-12-04 20:13:27
+  (flag legend: 'kidnappings' is the DETENTION flag — 1 when the victim was held against
+   their will at any point, tied, locked in, held at gunpoint or taken away; it is NOT the
+   same as the 'Kidnapping' scenario, which means taken away and held. See README, Definitions.)
 
 AI SUMMARY  [revised on review, verified against the sources in this file. Live DB still holds the shorter bulk-import summary — apply this to it.]
   **Victims:** A Chinese businessman (referred to only as "K") who ran contract nickel-mining operations in the Philippines. He was the only known survivor among more than 100 kidnappings, most of them targeting Chinese nationals, recorded in the country that year.
@@ -34,7 +37,7 @@ AI SUMMARY  [revised on review, verified against the sources in this file. Live
   
   **Attack Method:** On the morning of 12 December 2022 the bodyguard let the crew ambush the car just after it left the compound; two men in construction-worker uniforms forced their way in, hooded and handcuffed him, and switched vehicles. He was held blindfolded for six days, 12-18 December, and never saw his captors' faces.
   
-  **Violence Used:** Stun guns, heated coils and burns, and a knife drawn across his chest, concentrated in the first two days; he later needed two surgeries for burns and shackle wounds. He stayed deliberately compliant to limit the abuse.
+  **Violence Used:** Detention — hooded, handcuffed and held blindfolded for six days; stun guns, heated coils and burns, and a knife drawn across his chest, concentrated in the first two days; he later needed two surgeries for burns and shackle wounds. He stayed deliberately compliant to limit the abuse.
   
   **Crypto Demanded/Stolen:** The captors opened at US$100 million and were negotiated down through US$50M and US$20M to a final figure. His wife withdrew cash under police escort and, inside a Manila casino the gang used to launder money, converted it to USDT (Tether) and transferred it to the kidnappers.