fix(review): queue an anchored file with its saver's pair as the choice (#390)

Maintainer ruling: a file never falls through both the link and the
queue. When only the saver anchor resolves a file the default profile and
the parser floor leave unlinked, the scan queues it with the anchor's pair
as its one candidate (evidence anchor: saver), never linking it. Files
already linked or resolved by the default path are unchanged. Apply
accepts the anchored pair when the bytes now resolve to it, and an
anchored item is a choice the untraced settle keeps.

database/review_schema.py

@@ -235,7 +235,9 @@ def evidence_offers_choice(evidence: Any) -> bool:
     candidates = evidence.get("candidates")
     if not isinstance(candidates, list):
         return False
-    return sum(1 for c in candidates if choosable(c)) >= MIN_CHOOSABLE
+    # The saver anchor's one pair (#390) is a suggestion to confirm.
+    needed = 1 if evidence.get("anchor") == "saver" else MIN_CHOOSABLE
+    return sum(1 for c in candidates if choosable(c)) >= needed
 
 
 def evidence_digest(text: str) -> str: