Audit: 5-reviewer sweep — 19 fixes across every stage, +24 tests

Correctness: review vetoes persist via a dedupe_veto column (resolve
re-runs no longer overturn humans); diff emits second copies whose
confident version matches no owned copy (spec: pairs own only on both
ids) and fetches the live collection with refresh; resolve pairs
titles.json entries to rows by title so a reshoot photo updates
provenance instead of duplicating rows; version lookups survive empty
/thing results; publisher tie-break now honors the mixed
base/expansion veto and refuses multi-candidate picks; empty-normalized
(non-Latin) titles never count as exact.

Upload: LoginError aborts a run instead of logging N bogus failures
(and 3 identical consecutive failures abort as systemic); Cloudflare
interstitials are detected; added-without-version gets its own logged
status that verify understands; same-game updates run one per pass so
the name-targeted row edit can't overwrite a fresh version; absent
diff outputs fail loudly; pagination clicks are paced.

Web review: a lock serializes freshen/decide (threadpool race dropped
decisions); failed saves roll memory back and always alert the browser
(non-JSON 500s included); session warnings reach the page instead of a
StringIO; state-load failures and dead servers show banners instead of
a blank page; duplicate (title, photos) rows are addressable by
ordinal.

Consistency: shared CONFIDENT_VERSION_STATUSES, client_for(),
Config paths for every artifact, one review-port constant, named
matching thresholds, strict collection-id parsing, error-doc responses
never cached, unknown config keys warn, extract reports dropped vision
entries, fixture generators share escaping + marker text.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/write_stub_fixtures.py

@@ -14,6 +14,8 @@ from __future__ import annotations
 
 from pathlib import Path
 
+from fixture_common import esc, write_cache_marker
+
 from bggpipe.bgg_client import cache_key
 
 FIXTURE_CACHE = Path("tests/fixtures/bgg_cache")
@@ -24,7 +26,7 @@ def search_item(bgg_id: int, name: str, year: int | None, type_: str) -> str:
     year_xml = f'<yearpublished value="{year}"/>' if year else ""
     return (
         f'<item type="{type_}" id="{bgg_id}">'
-        f'<name type="primary" value="{name}"/>{year_xml}</item>'
+        f'<name type="primary" value="{esc(name)}"/>{year_xml}</item>'
     )
 
 
@@ -104,10 +106,7 @@ THINGS = {
 
 def main() -> None:
     FIXTURE_CACHE.mkdir(parents=True, exist_ok=True)
-    (FIXTURE_CACHE / "STUB_FIXTURES.marker").write_text(
-        "This cache contains hand-written stub XML, not real BGG "
-        "responses. Data resolved from it must not be uploaded.\n"
-    )
+    write_cache_marker(FIXTURE_CACHE)
     for query, items in SEARCHES.items():
         key = cache_key("search", {"query": query, "type": SEARCH_TYPES})
         total = items.count("<item ")