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/fetch_sources.py

@@ -115,6 +115,30 @@ def fetch_raw(url, timeout=30):
         return r.status, raw.decode(charset, errors="replace"), r.geturl()
 
 
+WAYBACK_AVAIL = "https://archive.org/wayback/available?url="
+
+
+def fetch_wayback(url, timeout=40):
+    """Fetch the closest Wayback Machine snapshot of a URL.
+
+    Returns (timestamp, snapshot_url, html) or (None, None, None) when nothing is
+    archived. The `id_` flag asks for the original bytes without the Wayback toolbar,
+    so extraction runs on the same markup a live fetch would have seen. A snapshot is
+    a third party's copy taken on a given date, so anything staged from it must say so.
+    """
+    import urllib.parse
+    q = WAYBACK_AVAIL + urllib.parse.quote(url, safe="")
+    with urllib.request.urlopen(urllib.request.Request(q, headers={"User-Agent": UA}),
+                                timeout=timeout) as r:
+        closest = json.loads(r.read().decode("utf-8")).get("archived_snapshots", {}).get("closest")
+    if not closest or not closest.get("available"):
+        return None, None, None
+    ts = closest["timestamp"]
+    raw_url = f"https://web.archive.org/web/{ts}id_/{url}"
+    status, html, final = fetch_raw(raw_url, timeout=timeout)
+    return ts, closest["url"], html
+
+
 def stage_case(rec, extra_urls=(), new_only=False):
     cid = rec["id"]
     out = STAGING / f"{cid:03d}"