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/051_Costcutters.txt

@@ -26,6 +26,9 @@ DATABASE RECORD
   notes               they threatened the employees with a machete
   has_processed_date  1
   created_at          2025-11-13 05:44:45
+  (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  [generated at bulk import, NOT verified against sources]
   **Victim:** Costcutters
@@ -94,19 +97,19 @@ A spokeswoman for Northamptonshire Police said: "All the men wore face coverings
 Anyone who witnessed the robbery, saw the men in the area at the time, or who has information about the incident is asked to call Northamptonshire Police on 101.
 
 ------------------------------------------------------------------------------------------------
-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.
+FETCHED ARTICLE 1  [AUTO-TRIMMED — UNREVIEWED]
+  !! Furniture was cut by a script keyed on this case's record, not by a person.
+  !! It may still carry passages about OTHER cases from a round-up article.
+  !! The full page extract is kept in staging/ if a cut needs revisiting.
   Source     northamptonchron.co.uk
   URL        https://www.northamptonchron.co.uk/news/masked-men-with-weapons-rob-northampton-shop-for-bitcoin-machine-73035
   Field      url
   Retrieved  2026-09-05T12:54:58+00:00 via raw HTTP retrieval, deterministic extraction (HTTP 200)
   Language   unknown
-  Kept       paragraphs ALL 10 paragraphs, untrimmed
-  Length     1,347 chars
-  Integrity  sha256 7aebab7b9e2f653214cd7ae384adb4842d0802a247562c3384bf51a57c25d62e
-  Trimmed    NOT TRIMMED. Full page extract; trim on read-through.
+  Kept       paragraphs headline [0] + 1-8 of 10
+  Length     1,245 chars
+  Integrity  sha256 6b25e6197eba888787c94086050cec2a467dfaecfd833ee62e6f548a22e01fd6
+  Trimmed    AUTO-TRIMMED, unreviewed: kept paragraphs 1-8 plus headline [0]; dropped 0 leading and 1 trailing paragraphs. Case-term hits on page: 8.
   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.
 ------------------------------------------------------------------------------------------------
@@ -131,8 +134,6 @@ A spokeswoman for Northamptonshire Police said: "All the men wore face coverings
 
 Anyone who witnessed the robbery, saw the men in the area at the time, or who has information about the incident is asked to call Northamptonshire Police on 101.
 
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 generated from attacks-export-Gart-website.json + reported_K&R  |  case 051
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