fix(versions): review findings on PR #193

- A version no longer hides behind an original that duplicates resolve
  demoted (visible_version_clause, hidden_version_rows).
- Recording a link drops the version's faces, CLIP data and clip failures
  (covers link-at-ingest and link_versions --apply).
- The display file must live in the original's library; otherwise the
  original shows, and PUT /image/versions/display answers 400.
- link_new_files looks up hashes in chunks of 500 and logs errors.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CLAUDE.md

@@ -390,13 +390,18 @@ for the `link_versions` binary).
   date drains never fight the copy. Memories therefore put a standalone version on
   the original's day.
 - **Hiding** uses the same reachability rule as `duplicate_of_hash`, with one
-  addition: a version row is hidden only while a row for its original exists *in
-  the current view* (`visible_version_clause`; unscoped = any library). A version
-  whose original was deleted, or lives outside the requested library, shows as a
+  addition: a version row is hidden only while its original is *shown in the
+  current view*: a row exists there and was not demoted by duplicates resolve
+  (`visible_version_clause`; unscoped = any library). A version
+  whose original was deleted, demoted, or lives outside the requested library, shows as a
   normal photo, so nothing disappears silently. Applied in `/photos` (SQL for the
   recursive listing, `hidden_version_rows` for the folder walk and tag branch),
   `/memories` and reels, `/photos/exif`, `/photos/gps-summary`, unified search, the
   camera counts and the media gauges; `include_versions=true` lists them.
+- **Display file** is fetched through the original's library, so the display
+  choice only counts when the chosen version has a row there (else the original
+  shows; `PUT /image/versions/display` answers 400). Recording a link also drops
+  the version's `face_detections`, CLIP columns and `clip_failures`.
 - **Tags and favorites** written or read on a version path bind to the original
   (`canonical_rel_path` in the tag/favorite DAOs, `get_rel_paths_sharing_content`
   for reads). Insight generation on a version path runs against the original. A